1a. A head covering of hard material, such as leather, metal, or plastic, worn by football players, firefighters, construction workers, motorcyclists, and others to protect the head. b. The headgear with a glass mask worn by deep-sea divers. c. A pith helmet; a topi. d. A head covering, such as a balaclava, that is shaped like a helmet. 2. A piece of armor, usually made of metal, designed to protect the head. 3.Botany The hood-shaped sepal or corolla of some flowers.
TRANSITIVE & INTRANSITIVE VERB:
Inflected forms: hel·met·ed, hel·met·ing, hel·mets To provide with or put on a helmet.
ETYMOLOGY:
Middle English, from Old French, diminutive of helme, of Germanic origin. See kel-1 in Appendix I.