Etymology
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matricide (n.)

1590s, "act of killing one's mother;" 1630s, "one who kills his mother;" from French matricide, from Latin mātricida "mother-killer," and mātricidium "mother-killing," from combining form of māter "mother" (see mother (n.1)) + -cida "killer," and -cidium "a killing," from caedere "to slay" (from PIE root *kae-id- "to strike"). Related: Matricidal (adj.). Old English had moðorslaga "a matricide, a mother-slayer."

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*kae-id- 

*kaə-id-, Proto-Indo-European root meaning "to strike."

It forms all or part of: abscise; avicide; biocide; caesarian; caesura; cement; chisel; -cide; circumcise; circumcision; concise; decide; decision; deicide; excise (v.); excision; felicide; feticide; filicide; floricide; fratricide; fungicide; gallinicide; genocide; germicide; herbicide; homicide; incise; incision; incisor; infanticide; insecticide; legicide; liberticide; libricide; matricide; parricide; patricide; pesticide; precise; precision; prolicide; scissors; senicide; spermicide; suicide; uxoricide; verbicide.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit skhidati "beats, tears;" Latin caedere "to strike down, fell, slay;" Lithuanian kaišti "shave;" Armenian xait'em "to stab;" Albanian qeth "to shave;" Middle Dutch heien "to drive piles," Old High German heia "wooden hammer," German heien "beat."

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