Usually means: Protective headgear for safety, sports.
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We found 46 dictionaries that define the word helmet:

General (27 matching dictionaries)
  1. helmet: Merriam-Webster
  2. helmet: Oxford Learner's Dictionaries
  3. helmet: American Heritage Dictionary of the English Language
  4. helmet: Collins English Dictionary
  5. helmet: Vocabulary.com
  6. Helmet, helmet: Wordnik
  7. helmet: Cambridge Advanced Learner's Dictionary
  8. Helmet: InfoVisual Visual Dictionary
  9. helmet: Wiktionary
  10. helmet: Webster's New World College Dictionary, 4th Ed.
  11. helmet: The Wordsmyth English Dictionary-Thesaurus
  12. helmet: Infoplease Dictionary
  13. Helmet, helmet: Dictionary.com
  14. helmet: Online Etymology Dictionary
  15. Helmet (band), Helmet (cricket), Helmet (disambiguation), Helmet (heraldry), Helmet (pigeon), Helmet, The Helmet: Wikipedia, the Free Encyclopedia
  16. Helmet: Online Plain Text English Dictionary
  17. helmet: Webster's Revised Unabridged, 1913 Edition
  18. helmet: Rhymezone
  19. helmet: AllWords.com Multi-Lingual Dictionary
  20. helmet: Webster's 1828 Dictionary
  21. helmet: FreeDictionary.org
  22. helmet: Mnemonic Dictionary
  23. helmet: TheFreeDictionary.com
  24. helmet: Cambridge Essential American English Dictionary
  25. helmet: Longman Dictionary of Contemporary English

Art (1 matching dictionary)
  1. An Illustrated Dictionary of Jewelry (No longer online)

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)
  1. helmet: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. helmet: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. Arms and Armour (No longer online)
  3. HELMET: Acronym Finder

Religion (2 matching dictionaries)
  1. Helmet: Easton Bible
  2. Helmet: Smith's Bible Dictionary

Science (1 matching dictionary)
  1. Archaeology Wordsmith (No longer online)

Slang (2 matching dictionaries)
  1. helmet: Green’s Dictionary of Slang
  2. helmet: English slang and colloquialisms used in the United Kingdom

Sports (5 matching dictionaries)
  1. Internet Karting Glossary (No longer online)
  2. Glossary of Canoe Terminology (No longer online)
  3. Helmet: Bicycle Glossary
  4. CAVE AND KARST TERMINOLOGY (No longer online)
  5. Helmet: Sports Definitions

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

(Note: See helmeted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (clothing) A hard, protective head covering, typically part of armour.
noun:  (heraldry) Such a helm when placed above a shield on a coat of arms.
noun:  That which resembles a helmet in form, position, etc.
noun:  The upper part of a chemist's retort.
noun:  The hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon.
noun:  A naked shield or protuberance on the top or fore part of the head of a bird.
noun:  The glans penis.
noun:  (by extension, derogatory) A contemptible or stupid person.
verb:  (transitive) To cover with, or as if with, a helmet.

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