prothesis (n.) Look up prothesis at Dictionary.com
from Greek prothesis "a placing before, a placing in public," from pro "before" (see pro-) + thesis "a placing" (from reduplicated form of PIE root *dhe- "to set, put"). In ecclesiastical sense from 1670s; grammatical from 1870. Related: Prothetic (1835 in grammar); prothetical; prothetically.