The definition of lethal is something very harmful or destructive, especially something that could cause death.
(adjective)A gun shot wound is an example of something that could be described as a lethal wound.
See lethal in Webster's New World College Dictionary
adjective
Origin: L letalis, lethalis < letum, death: see let
See lethal in American Heritage Dictionary 4
adjective
Origin:
Origin: Late Latin lēthālis
Origin: , alteration (probably influenced by Lēthē, Lethe)
Origin: of Latin lētālis
Origin: , from lētum, death
.Related Forms:
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