| a learned borrowing from Latin meaning “killer,” “act of killing,” used in the formation of compound words: pesticide, homicide. |

| -cide suff.
[Middle English, from Old French (from Latin -cīda, killer) and from Latin -cīdium, killing, both from caedere, to strike, kill; see kaə-id- in Indo-European roots.] |
-cide suff.
Killer: bactericide.
Act of killing: suicide.