Definitions of helmet
  1. noun
    a protective headgear made of hard material to resist blows
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    batting helmet
    a helmet worn by the batter in baseball
    crash helmet
    a padded helmet worn by people riding bicycles or motorcycles; protects the head in case of accidents
    football helmet
    a padded helmet with a face mask to protect the head of football players
    hard hat, safety hat, tin hat
    a lightweight protective helmet (plastic or metal) worn by construction workers
    a protective helmet for the head
    space helmet
    a helmet worn by astronauts while in outer space
    skid lid
    a crash helmet
    type of:
    headdress, headgear
    clothing for the head
  2. noun
    armor plate that protects the head
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    a medieval helmet with a visor and a neck guard
    a medieval steel helmet
    (15-16th century) any armor for the head; usually ornate without a visor
    a large medieval helmet supported on the shoulders
    cabasset, morion
    a metal helmet worn by common soldiers in the 16th century
    a spiked helmet worn by German soldiers
    salade, sallet
    a light medieval helmet with a slit for vision
    casquet, casquetel
    a light open casque without a visor or beaver
    type of:
    armor plate, armor plating, armour plate, plate armor, plate armour
    specially hardened steel plate used to protect fortifications or vehicles from enemy fire
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