hypothalamus (n.)
1896, coined 1893 in German from Greek hypo- "under" (see sub-) + thalamus "part of the brain where a nerve emerges."
hypothecate (v.)
1680s, from hypothecat-, past participle stem of Medieval Latin hypothecare, from Late Latin hypotheca, from Greek hypotheke "a deposit, pledge, mortgage," from hypo- "down" + tithenai "to put, place" (see theme). Related: Hypothecated; hypothecating; hypothecation.
hypothermia (n.)
1877, Modern Latin, from hypo- "under" (see hypo-) + Greek therme "heat" (see thermal).
hypotheses (n.)
plural of hypothesis.
hypothesis (n.)
1590s, from Middle French hypothese and directly from Late Latin hypothesis, from Greek hypothesis "base, basis of an argument, supposition," literally "a placing under," from hypo- "under" (see sub-) + thesis "a placing, proposition" (see thesis). A term in logic; narrower scientific sense is from 1640s.
hypothesise (v.)
chiefly British English spelling of hypothesize; for suffix, see -ize. Related: Hypothesised; hypothesising.
hypothesize (v.)
1738, from hypothesis + -ize. Related: Hypothesized; hypothesizing.
hypothetical (adj.)
1580s, from Greek hypothetikos "pertaining to a hypothesis," from hypothesis (see hypothesis). Related: Hypothetically; hypothetic.
hypotonia (n.)
1876, medical Latin, from hypo- + Greek tonos "tone" (see tenet).
hypotonic (adj.)
1873, from hypo- + tonic.
hypoxia (n.)
1941, from hypo- + oxygen. Related: Hypoxic.
hypsi-
word-forming element meaning "on high," from Greek hypsi "aloft, on high," related to hypsos "height;" cognate with Sanskrit os "above, over," Old Church Slavonic vysoku "high."
Hyrcania
ancient region southeast of the Caspian Sea, from Greek Hyrkania, said to be from an Indo-European *verkana "country of wolves" [Zonn, I., et al., "The Caspian Sea Encyclopedia," 2010]
hyssop (n.)
Old English ysope, from Irish Latin hysopus, from Greek hyssopos, a plant of Palestine, used in Jewish purification rites, from Hebrew 'ezobh (compare Syriac zupha, Arabic zufa).
hysterectomy (n.)
1886, coined in English from Greek hystera "womb" (see uterus) + -ectomy.
hysteresis (n.)
1805, from Greek hysteresis "a coming short, a deficiency."
hysteria (n.)
1801, coined in medical Latin as an abstract noun from hysteric (see hysterical).
hysteric (adj.)
1650s, from Latin hystericus, from Greek hysterikos “belonging to the womb” (see hysterical). As a noun from 1751.
hysterical (adj.)
1610s, from Latin hystericus "of the womb," from Greek hysterikos "of the womb, suffering in the womb," from hystera "womb" (see uterus). Originally defined as a neurotic condition peculiar to women and thought to be caused by a dysfunction of the uterus. Meaning "very funny" (by 1939) is from the notion of uncontrollable fits of laughter. Related: Hysterically.
hysterics (n.)
1727, from hysterical. Sometimes in 19c. jocularly folk-etymologized as high-strikes (1838).
hysteron proteron
1560s, from Late Latin, from Greek, literally "the latter (put as) the former." A figure of speech in which what should come last is put first, from hysteron, neuter of hysteros "latter, second, after" (from PIE *ud-tero-, from root *ud- "up, out;" see out) + proteron, neuter of proteros "before, former," from PIE *pro-, from root *per- (1) "forward, through" (see per).