1610s, "the killing of a god;" 1650s, "one who kills a god," from stem of Latin deus "god" (see Zeus) + -cida "slayer," from caedere "to kill, to cut down" (from PIE root *kae-id- "to strike").
dehortation
dehumanize
dehumidifier
dehydrate
de-ice
deicide
deictic
deific
deification
deify
deign