a defensive covering for the head. see casque, headpiece, morion, sallet, and illust. of beaver.-the representation of a helmet over shields or coats of arms, denoting gradations of rank by modifications of form.-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.-that which resembles a helmet in form, position, etc.-the upper part of a retort.-the hood-formed upper sepal or petal of some flowers, as of the monkshood or the snapdragon.-a naked shield or protuberance on the top or fore part of the head of a bird.