from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A padded helmet, as one worn by bicyclists, motorcyclists, or aviators, to protect the head in case of accident.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A helmet worn by motorcyclists worn to protect the head in case of an accident.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a padded helmet worn by people riding bicycles or motorcycles; protects the head in case of accidents


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