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1 definition found
for Helmet shell
From The Collaborative International Dictionary of English v.0.48 :
Helmet \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) (Zool.) A naked shield or protuberance on the top or
fore part of the head of a bird.
Helmet beetle (Zool.), a leaf-eating beetle of the family
Chrysomelid[ae], having a short, broad, and flattened
body. Many species are known.
Helmet shell (Zool.), 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 (Zool.), an African wood shrike of the genus
Prionodon, having a large crest.
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