galea

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A helmet-shaped part, such as the upper petal of certain plants or part of the maxilla of an insect.

Century Dictionary and Cyclopedia

1. n. A helmet, or something resembling a helmet in shape or position.
2. n. [capitalized] In zoology, a genus of fossil sea-urchins or echini of galeate form.
3. n. In entomology, an appendage of the stipes of the maxilla of some insects, as distinguished from the lacinia, another appendage of the same gnathite. Thus, in the cockroach the galea is soft, rounded, and possibly sensory in function, while the lacinia is a hard curved blade, serrate and spinose. See lacinia. The extremity of the maxillæ is often terminated by two divisions or lobes, of which the outer, in the Orthoptera, is termed the galea. In Cuvier's Règne Anim. (tr. of 1849), p. 474.
4. n. In ornithology, a frontal shield, as that of a coot or gallinule; a horny casque upon the head, as that of the cassowary (see cut under cassowary); a great helmet-like boss upon the bill, as in the hornbill. See cut under hornbill.
5. n. In anatomy: The amnion; especially, the part of the amnion which may cover the head of a new-born infant like a cowl. Also called caul. The galea capitis (which see, below).
6. n. In botany, a name given to the parts of the calyx or corolla when they assume the form of helmet, as the upper lip of a ringent corolla.
7. n. In pathology, headache extending all over the head.
8. n. In surgery, a bandage for the head.

Wiktionary

1. n. a Roman helmet
2. n. botany an organ or a part of a plant that is shaped like a galea (helmet)
3. n. entomology a mouthpart found in some species of chewing insect, which is shaped like a galea (helmet)
4. n. surgery A kind of bandage for the head.
5. n. medicine A headache extending all over the head.

GNU Webster's 1913

1. n. (Bot.) The upper lip or helmet-shaped part of a labiate flower.
2. n. (Surg.) A kind of bandage for the head.
3. n. (Pathol.) Headache extending all over the head.
4. n. (Paleon.) A genus of fossil echini, having a vaulted, helmet-shaped shell.
5. n. (Zoöl.) The anterior, outer process of the second joint of the maxillae in certain insects.

WordNet 3.0

1. n. an organ shaped like a helmet; usually a vaulted and enlarged petal as in Aconitum