EPA Look up EPA at Dictionary.com
initialism (acronym) for Environmental Protection Agency, U.S. federal agency proposed by President Richard Nixon and created in December 1970.
epact (n.) Look up epact at Dictionary.com
1550s, "number of days by which the solar year exceeds a lunar one of 12 moons;" also "number of days into the moon on which the solar year begins;" from French épacte (12c.), from Late Latin epacta "an intercalary day," from Greek epaktos, literally "brought in, imported," verbal adjective of epagein "to intercalate, add, bring forward," from epi "on" (see epi-) + agein "to bring, to lead" (see act (v.)).
epaulet (n.) Look up epaulet at Dictionary.com
1783, from French épaulette (16c.), diminutive of épaule "shoulder," from Old French espaule (12c.), from Latin spatula "flat piece of wood, splint," later "shoulder blade," diminutive of spatha "broad wooden instrument, broad sword," from Greek spathe "a broad flat sword" (see spade (n.1)).
epee (n.) Look up epee at Dictionary.com
1889, from French épée, literally "sword" from Old French espe (9c., spede) "spear, lance," from Latin spatha (see epaulet).
epeiric (adj.) Look up epeiric at Dictionary.com
in reference to seas covering continental shelves, 1917, from Greek epeiros "mainland" + -ic.
epexegesis (n.) Look up epexegesis at Dictionary.com
"words added to convey more clearly the meaning intended," 1620s, from Greek epexegesis, from epi "in addition" (see epi) + exegeisthai "to explain" (see exegesis).
ephah (n.) Look up ephah at Dictionary.com
Hebrew dry measure, probably of Egyptian origin.
ephebic (adj.) Look up ephebic at Dictionary.com
1880 (the noun, ephebe, is attested from 1690s), from Greek ephebos "of age 18-20," from epi "upon" (see epi-) + hebe "early manhood," from PIE *yegw-a- "power, youth, strength." In classical Athens, a youth of 18 underwent his dokimasia, had his hair cut off, and was enrolled as a citizen. His chief occupation for the next two years was garrison duty.
ephedra (n.) Look up ephedra at Dictionary.com
genus of low, branchy desert shrubs, 1914, from Modern Latin (1737) from Greek ephedra, a name given by Pliny to the horsetail, literally "sitting upon," from fem. of ephedros, from epi "on" (see epi-) + hedra "seat, base, chair, face of a geometric solid" (see sedentary). The reason for the name is not known.
ephedrine (n.) Look up ephedrine at Dictionary.com
1889, named 1887 by Japanese organic chemist Nagai Nagayoshi (1844-1929), from the plant ephedra, from which it was first extracted, + chemical suffix -ine (2).
ephemera (n.) Look up ephemera at Dictionary.com
late 14c., originally a medical term, from Medieval Latin ephemera (febris) "(fever) lasting a day," from fem. of ephemerus, from Greek ephemeros "lasting only one day, short-lived," from epi "on" (see epi-) + hemerai, dative of hemera "day," from PIE *amer- "day."

Sense extended 17c. to short-lived insects and flowers; general sense of "thing of transitory existence" is first attested 1751. Compare Greek ephemeroi "men," literally "creatures of a day."
ephemeral (adj.) Look up ephemeral at Dictionary.com
1560s; see ephemera + -al (1). Related: Ephemerality. Originally of diseases and lifespans; extended sense of "transitory" is from 1630s.
ephemeris (n.) Look up ephemeris at Dictionary.com
table showing predicted positions of heavenly bodies, 1550s, Modern Latin, from Greek ephemeris "diary, calendar," from ephemeros "daily" (see ephemera). The classical plural is ephemerides.
ephemeron (n.) Look up ephemeron at Dictionary.com
1620s, from Greek (zoon) ephemeron, neuter of ephemeros (see ephemera). Figurative use by 1771.
Ephesians (n.) Look up Ephesians at Dictionary.com
New Testament epistle, late 14c., addressed to Christian residents of the Greek city of Ephesus, in what is now western Turkey.
Ephesus Look up Ephesus at Dictionary.com
Greek city in ancient Asia Minor, center of worship for Artemis, Greek Ephesos, traditionally derived from ephoros "overseer," in reference to its religious significance, but this might be folk etymology.
ephialtes (n.) Look up ephialtes at Dictionary.com
nightmare or demon that causes nightmares, c.1600, from Greek Ephialtes, name of a demon supposed to cause nightmares; the ancient explanation is that it was from ephallesthai "to leap upon," but OED finds "considerable" phonological difficulties with this.
ephod (n.) Look up ephod at Dictionary.com
Hebrew ephod, from aphad "to put on."
ephor (n.) Look up ephor at Dictionary.com
"Spartan magistrate," 1580s, from Greek ephoros "overseer," from epi- "over" (see epi-) + horan "to see," possibly from PIE root *wer- (4) "to perceive" (see ward (n.)).
Ephraim Look up Ephraim at Dictionary.com
masc. personal name, in Old Testament, younger son of Joseph; also the tribe descended from him, sometimes used figuratively for "Kingdom of Israel;" Greek form of Hebrew Ephrayim, a derivative of parah "was fruitful" (related to Aramaic pera "fruit").
epi- Look up epi- at Dictionary.com
word-forming element meaning "on, upon, above," also "in addition to; toward, among," from Greek epi "upon, at, close upon (in space or time), on the occasion of, in addition," from PIE *epi, *opi "near, at, against" (cognates: Sanskrit api "also, besides;" Avestan aipi "also, to, toward;" Armenian ev "also, and;" Latin ob "toward, against, in the way of;" Oscan op, Greek opi- "behind;" Hittite appizzis "younger;" Lithuanian ap- "about, near;" Old Church Slavonic ob "on"). Before unaspirated vowels, reduced to ep-; before aspirated vowels, eph-. A productive prefix in Greek; also used in modern scientific compounds (such as epicenter).
epic (adj.) Look up epic at Dictionary.com
1580s, perhaps via Middle French épique or directly from Latin epicus, from Greek epikos, from epos "word, story, poem," from PIE *wekw- "to speak" (see voice). Extended sense of "grand, heroic" first recorded in English 1731. From 1706 as a noun in reference to an epic poem, "A long narrative told on a grand scale of time and place, featuring a larger-than-life protagonist and heroic actions" [Miller Williams, "Patterns of Poetry].
epicene (adj.) Look up epicene at Dictionary.com
mid-15c., epycen, originally a grammatical term for nouns that may denote either gender, from Latin epicoenus "common," from Greek epikoinos "common to many, promiscuous," from epi "on" (see epi-) + koinos "common" (see coeno-). Extended sense of "characteristic of both sexes" first recorded in English c.1600; that of "effeminate" 1630s.
epicenter (n.) Look up epicenter at Dictionary.com
1887, from Modern Latin epicentrum (1879 in geological use); see epi- + center. Related: Epicentral (1866).
epicentre (n.) Look up epicentre at Dictionary.com
chiefly British English spelling of epicenter; for spelling, see -re.
epicure (n.) Look up epicure at Dictionary.com
late 14c., "follower of Epicurus," from Latin Epicurus, from Greek Epicouros (341-270 B.C.E.), Athenian philosopher who taught that pleasure is the highest good and identified virtue as the greatest pleasure; the first lesson recalled, the second forgotten, and the name used pejoratively for "one who gives himself up to sensual pleasure" (1560s), especially "glutton, sybarite" (1774). Epicurus' school opposed by stoics, who first gave his name a reproachful sense. Non-pejorative meaning "one who cultivates refined taste in food and drink" is from 1580s.
epicurean (n.) Look up epicurean at Dictionary.com
late 14c., "follower of the philosophical system of Epicurus;" 1570s, "one devoted to pleasure," from Old French Epicurien, or from epicure + -ian. As an adjective, attested from 1580s in the philosophical sense and 1640s with the meaning "pleasure-loving."
epicureanism (n.) Look up epicureanism at Dictionary.com
1751, with reference to a philosophy; 1847 in a general sense, from epicurean + -ism. Earlier was epicurism (1570s).
epicureous (adj.) Look up epicureous at Dictionary.com
"epicurean," 1550s, from Latin epicureus, from Greek epikoureios (see epicure).
epicycle (n.) Look up epicycle at Dictionary.com
late 14c., from Latin epicyclus, from Greek epikyklos, from epi (see epi-) + kyklos (see cycle (n.)).
epidemic (adj.) Look up epidemic at Dictionary.com
c.1600, from French épidémique, from épidemié "an epidemic disease," from Medieval Latin epidemia, from Greek epidemia "prevalence of an epidemic disease" (especially the plague), from epi "among, upon" (see epi-) + demos "people, district" (see demotic).
epidemic (n.) Look up epidemic at Dictionary.com
1757, from epidemic (adj.); earlier epideme (see epidemy). An Old English noun for this (persisting in Middle English) was man-cwealm.
epidemiology (n.) Look up epidemiology at Dictionary.com
"study of epidemics," 1873, from Greek epidemios "epidemic" (see epidemic) + -logy. Related: Epidemiological; epidemiologist.
epidemy (n.) Look up epidemy at Dictionary.com
"an epidemic disease," especially the plague, late 15c., ipedemye, impedyme, from Old French ypidime (12c., Modern French épidémie), from Late Latin epidemia (see epidemic (adj.)).
epidermis (n.) Look up epidermis at Dictionary.com
1620s, from Greek epidermis, from epi "on" (see epi-) + derma "skin" (see derma). Related: Epidermal; epidermic.
epididymis (n.) Look up epididymis at Dictionary.com
c.1600, "fleshy mass at the back of the testicles," Modern Latin, literally "that which is on the testicles," from Greek epididymis, a word probably coined by Greek anatomist Herophilus (c.300 B.C.E.) from epi "on" (see epi-) + didymos "testicle," literally "double, twofold" (adj.). "To save his Epididamies" [Richard Brome, "The Court Beggar," 1652].
epidural (adj.) Look up epidural at Dictionary.com
1882, from epi- + dura (mater) (see dura mater). The noun meaning “injection into the epidural region” (usually during childbirth) is attested by 1970.
epiglottis (n.) Look up epiglottis at Dictionary.com
1520s, from Late Latin epiglottis, from Greek epiglottis, literally "(that which is) upon the tongue," from epi "on" (see epi-) + glottis, from glotta, variant of glossa "tongue" (see gloss (n.2)). An earlier form was epiglote (c.1400), from Old French epiglotte. Related: Epiglottic.
epigone (n.) Look up epigone at Dictionary.com
also epigon, "undistinguished scions of mighty ancestors," (sometimes in Latin plural form epigoni), from Greek epigonoi, in classical use with reference to the sons of the Seven who warred against Thebes; plural of epigonos "born afterward" from epi (see epi-) + -gonos, from root of gignesthai "to be born" related to genos "race, birth, descent" (see genus).
epigram (n.) Look up epigram at Dictionary.com
mid-15c., from Middle French épigramme, from Latin epigramma "an inscription," from Greek epigramma "an inscription, epitaph, epigram," from epigraphein "to write on, inscribe" (see epigraph). Related: Epigrammatist.
epigrammatic (adj.) Look up epigrammatic at Dictionary.com
1704, shortened from epigrammatical (c.1600); see epigram.
epigraph (n.) Look up epigraph at Dictionary.com
1620s, "inscription on a building, statue, etc.," from Greek epigraphe "an inscription," from epigraphein "to write on," from epi "on" (see epi-) + graphein "to write" (see -graphy). Sense of "motto; short, pithy sentence at the head of a book or chapter" first recorded in English 1844.
epilepsy (n.) Look up epilepsy at Dictionary.com
1570s, from Middle French epilepsie (16c.), from Late Latin epilepsia, from Greek epilepsia "seizure," from epi "upon" (see epi-) + lepsis "seizure," from leps-, future stem of lambanein "take hold of, grasp" (see analemma).

Earlier was epilencie (late 14c.), from Middle French epilence, with form influenced by pestilence. The native name was falling sickness.
epileptic (adj.) Look up epileptic at Dictionary.com
c.1600, from French épileptique, from Late Latin epilepticus, from Greek epileptikos, from epilambanein (see epilepsy). Earlier adjective was epilentic (late 14c.), from a Greek variant. As a noun from 1650s.
epilogue (n.) Look up epilogue at Dictionary.com
early 15c., from Middle French epilogue (13c.), from Latin epilogus, from Greek epilogos "conclusion of a speech," from epi "upon, in addition" (see epi-) + logos "a speaking" (see lecture (n.)). Earliest English sense was theatrical.
epinephrine (n.) Look up epinephrine at Dictionary.com
1883, from epi- "upon" + Greek nephros "kidney" (see nephron) + chemical suffix -ine (2). So called because the adrenal glands are on the kidneys.
epiphany (n.) Look up epiphany at Dictionary.com
early 14c., "festival of the manifestation of Christ to the gentiles" (celebrated Jan. 6; usually with a capital -E-), from Old French epiphanie, from Late Latin epiphania, neuter plural (taken as feminine singular), from late Greek epiphaneia "manifestation, striking appearance" (in New Testament, "advent or manifestation of Christ"), from epiphanes "manifest, conspicuous," from epiphainein "to manifest, display," from epi "on, to" (see epi-) + phainein "to show" (see phantasm).

Of divine beings other than Christ, first recorded 1660s; general literary sense of "any manifestation or revelation" appeared 1840, first in De Quincey.
epiphenomenon (n.) Look up epiphenomenon at Dictionary.com
1706, "secondary symptom," from epi- + phenomenon. Plural is epiphenomena. Related: Epiphenomenal.
epiphyte (n.) Look up epiphyte at Dictionary.com
1816 (implied in epiphytous), from epi- "upon" + -phyte "plant."
episcopacy (n.) Look up episcopacy at Dictionary.com
1640s; see episcopal + -cy.