- helmet - armor plate that protects the head
--1 is a kind of armor plate, armour plate, armor plating, plate armor, plate armour
--1 is a part of
--1 has parts: visor, vizorbody armor, body armour, suit of armor, suit of armour, coat of mail, cataphract
--1 has particulars:armet; basinet; casque; heaume; morion, cabasset; pickelhaube; sallet, sallade - helmet - a protective headgear made of hard material to resist blows
--2 is a kind of headdress, headgear
--2 has part: beaver
--2 has particulars:batting helmet; crash helmet; football helmet; hard hat, tin hat, safety hat; headpiece; space helmet - helmet - a protective headgear made of hard material to resist blows