lethal

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lethal¹

  • /ˈliː.θəl/

Rhymes with -iːθəl

Where it comes from

Learned borrowing from Latin lētālis (“deadly, mortal, fatal”), improperly written lēthālis, from lētum (“death”), improperly written as lēthum, from a supposed connection with Ancient Greek λήθη (lḗthē, “oblivion, forgetfulness”).

adjective more lethal · most lethal

  1. Of, pertaining to, or causing death; deadly; mortal; fatal. Whether modern, industrial man is less or more warlike than his hunter-gatherer ancestors is impossible to determine. The machine gun is so much more lethal than the bow and arrow that comparisons are meaningless.

noun lethals

  1. Any weapon that causes death.

    Opposite: non-lethal

  2. An allele that causes the death of the organism that carries it.

lethal²

  • /ˈliː.θəl/

Rhymes with -iːθəl

Where it comes from

Abbreviation of “lauric acid ethereal salt”, so called because it occurs in the ethereal salt of lauric acid.

noun

  1. uncountable One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline solid.

Thesaurus

Closest in meaning: deadly, fatal, mortal, life-threatening, destructive, dead, devastating, murderous, homicidal, killer, disastrous, murderer, catastrophic, harmful, pernicious, daunting

Translations

Every language

adj of, pertaining to, or causing death; deadly; mortal; fatal

Españolletal
한국어치명적인 chimyeongjeog-in, 치사의 chisaui
日本語必殺の hissatsu no, 致命的な chimeiteki na, 致死の chishi no
中文致命的 zhìmìng de, 致死的 zhìsǐdē
Portuguêsfatal, letal, mortal
Françaislétal, léthal, mortel, fatal
Deutschtödlich, letal
Italianoletale
Ελληνικάφονικός fonikós, θανατηφόρος thanatifóros
Русскийсмерте́льный smertélʹnyj, смертоно́сный smertonósnyj, лета́льный letálʹnyj
العربيةمُمِيت mumīt

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MLA

"lethal." Wiktionary, via Micwyn, micwyn.com/word/lethal. Accessed 6 Nov. 2026.

APA

lethal. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/lethal

Chicago

"lethal." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/lethal.

BibTeX
@misc{lethal_2026,
  title = {lethal},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/lethal},
  urldate = {2026-11-06}
}