LATIN DICTIONARYLexicon Latīnum
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“parricide” in Latin

The English word parricide itself goes back to Latin pār, through parricīdium.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

parricide
Murder of a parent, parricidium; caedes (general term for murder): to commit parricide, parricidium or caedem facere; parricidio se obstringere; parricidio se inquinare or se maculare, sanguine nefando se respergere.
The murderer of a parent, parricida: patris (matris, etc.) interfector (Quint.): parricida parentis sui; or, by circumlocution, qui patrem (matrem, etc.) occidit or necavit: parricidio obstrictus or inquinatus.

Quick answer

What is the Latin word for parricide?
The usual Latin words for “parricide” are parricīdium, caedēs, parricīda; also pater, māter, interfector. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.