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Learned borrowing from Latin lētālis (“mortal, deadly”), improperly written lēthālis, from lētum (“death”), improperly written as lēthum, as associated with Ancient Greek λήθη (lḗthē, “forgetfulness”).
lethal (plural lethals)
- Any weapon that causes death.
- Antonym: non-lethal
- (genetics) An allele that causes the death of the organism that carries it.
- (chemistry) One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline solid.