matricide (n.) Look up matricide at Dictionary.com
1590s, "action of killing one's mother," from French matricide, from Latin matricida "mother-killer," and matricidium "mother-killing," from combining form of mater "mother" (see mother (n.1)) + -cida "killer," and -cidium "a killing," from caedere "to slay" (from PIE root *kae-id- "to strike"). Meaning "one who kills his mother" is 1630s. Related: Matricidal (adj.). Old English had moðorslaga "matricide, mother-slayer."