Etymology
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helmet (n.)

mid-15c., perhaps a diminutive of Middle English helm (see helm (n.2)). But some sources suggest Old French heaumet (Modern French heaume), a French diminutive of helme "helmet," from the same Germanic source as helm (n.2); Barnhart writes: "Old English helm never became an active term in the standard vocabulary of English."

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Definitions of helmet

helmet (n.)
armor plate that protects the head;
helmet (n.)
a protective headgear made of hard material to resist blows;
From wordnet.princeton.edu