Definition of: helmet

(hel′mit) noun
1. A covering of defensive or protective armor for the head, made of metal, as worn by soldiers of all times, or of leather, as worn by football players.
2. Something resembling head armor in shape, position, or function: as, protective headgear, etc.; the metal head covering of a diving suit, or the wire–mesh headguard worn by fencers. [<OF, dim. of helme a helmet <Gmc.]
—hel′met·ed adjective
TYPES OF HELMETS
a. Helmet of Grecian warrior.
b. Casque, 16th century knight.
c. German, World War II.
d. Aviator's with head-phone.
e. Football player.
f. Space pilot.