- -cide "killer," from Fr. -cide, from L. -cida "cutter, killer, slayer," from -cidere, comb. form of caedere "to strike down, chop, beat, hew, fell, slay," from PIE *kae-id-, from root * (s)k(h)ai- "to strike" (Pokorny, not in Watkins; Cf. Skt. skhidati "beats, tears," Lith. kaisti "shave.") For Latin vowel change, see ACQUISITION (Cf. acquisition). The element also can represent "killing," from Fr. -cide, from L. -cidium "a cutting, a killing."
Etymology dictionary. 2014.