Helmet word meaning and definition

[noun] a protective headgear made of hard material to resist blows
[noun] armor plate that protects the head

\Hel"met\, n. [OF. helmet, a dim of helme, F. heaume; of Teutonic origin; cf. G. helm, akin to AS. & OS. helm, D. helm, helmet, Icel. hj[=a]lmr, Sw. hjelm, Dan. hielm, Goth. hilms; and prob. from the root of AS. helan to hide, to hele; cf. also Lith. szalmas, Russ. shleme, Skr. [,c]arman protection. [root]17. Cf. {Hele}, {Hell}, {Helm} a helmet.] 1. (Armor) A defensive covering for the head. See {Casque}, {Headpiece}, {Morion}, {Sallet}, and Illust. of {Beaver}. 2. (Her.) The representation of a helmet over shields or coats of arms, denoting gradations of rank by modifications of form. 3. A helmet-shaped hat, made of cork, felt, metal, or other suitable material, worn as part of the uniform of soldiers, firemen, etc., also worn in hot countries as a protection from the heat of the sun. 4. That which resembles a helmet in form, position, etc.; as:
(a) (Chem.) The upper part of a retort. --Boyle.
(b) (Bot.) The hood-formed upper sepal or petal of some flowers, as of the monkshood or the snapdragon.
(c) (Zo["o]l.) A naked shield or protuberance on the top or fore part of the head of a bird. {Helmet beetle} (Zo["o]l.), a leaf-eating beetle of the family {Chrysomelid[ae]}, having a short, broad, and flattened body. Many species are known. {Helmet shell} (Zo["o]l.), one of many species of tropical marine univalve shells belonging to {Cassis} and allied genera. Many of them are large and handsome; several are used for cutting as cameos, and hence are called {cameo shells}. See {King conch}. {Helmet shrike} (Zo["o]l.), an African wood shrike of the genus {Prionodon}, having a large crest.

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