What does -cide mean?

-cide meaning in Etymology Dictionary

word-forming element definition "killer," from French -cide, from Latin -cida "cutter, killer, slayer," from -cidere, comb. kind of caedere "to hit down, chop, beat, hew, fell, slay," from PIE *kae-id-, from root *(s)k(h)ai- "to strike" (Pokorny, maybe not in Watkins; cognates: Sanskrit skhidati "beats, tears," Lithuanian kaisti "shave," German heien "beat"). For Latin vowel modification, see purchase. The element also can express "killing," from French -cide, from Latin -cidium "a cutting, a killing."