google
ref
Middle English: from Old French, from Latin homicidium, from homo, homin- ‘man’.
wiktionary
ref
homicide + -al
etymonline
ref
homicidal (adj.)
1725, from homicide + -al (1), or from Late Latin homicidalis. Related: Homicidally. As an adjective, homicidious is from 1630s.
