Etymology

siblicide

sib·li·cide
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Today it means: The killing of a sibling, especially as observed among certain species of animals. Full definition →

First used 1980s
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The story

From sibli(ng) + -cide (suffix meaning ‘killing; killer’).

First known use, by meaning

  • from 1980s The killing of a sibling, especially as observed among certain species of animals.

Etymology from Wiktionary, CC BY-SA 4.0.