[lee-thuh l] /ˈli θəl/

of, relating to, or causing death; deadly; fatal:
a lethal weapon; a lethal dose.
made or carried out to cause death:
a lethal chamber; a lethal attack.
causing great harm or destruction:
The disclosures were lethal to his candidacy.
able to cause or causing death
of or suggestive of death

1580s, from Late Latin lethalis, alteration of Latin letalis “deadly, fatal,” from letum “death,” of uncertain origin. Form altered in Late Latin by association with lethe hydor “water of oblivion” in Hades in Greek mythology, from Greek lethe “forgetfulness.”

lethal le·thal (lē’thəl)


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