Usually means: Capable of causing death effectively.
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We found 35 dictionaries that define the word lethal:

General (26 matching dictionaries)
  1. lethal: Longman Dictionary of Contemporary English
  2. lethal: Merriam-Webster
  3. lethal: Oxford Learner's Dictionaries
  4. lethal: American Heritage Dictionary of the English Language
  5. lethal: Collins English Dictionary
  6. lethal: Vocabulary.com
  7. Lethal, lethal: Wordnik
  8. lethal: Wiktionary
  9. lethal: Webster's New World College Dictionary, 4th Ed.
  10. lethal: The Wordsmyth English Dictionary-Thesaurus
  11. lethal: Infoplease Dictionary
  12. lethal: Dictionary.com
  13. lethal: Online Etymology Dictionary
  14. lethal: Cambridge Essential American English Dictionary
  15. Lethal (American band), Lethal (Argentine band), Lethal (album), Lethal (band): Wikipedia, the Free Encyclopedia
  16. Lethal: Online Plain Text English Dictionary
  17. lethal: Webster's Revised Unabridged, 1913 Edition
  18. lethal: Rhymezone
  19. Lethal: AllWords.com Multi-Lingual Dictionary
  20. lethal: Webster's 1828 Dictionary
  21. lethal: FreeDictionary.org
  22. lethal: Mnemonic Dictionary
  23. lethal: TheFreeDictionary.com
  24. lethal: Cambridge Advanced Learner's Dictionary

Art (1 matching dictionary)
  1. lethal-: A Cross Reference of Latin and Greek Elements

Business (1 matching dictionary)
  1. lethal: Legal dictionary

Medicine (6 matching dictionaries)
  1. lethal: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Lethal: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. lethal: Medical dictionary
  6. Lethal: Drug Medical Dictionary

Slang (1 matching dictionary)
  1. lethal: Urban Dictionary

(Note: See lethality as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Of, pertaining to, or causing death; deadly; mortal; fatal.
noun:  Any weapon that causes death.
noun:  (genetics) An allele that causes the death of the organism that carries it.
noun:  (chemistry) One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline solid.

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