from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One of several narrow external openings connecting with the pharynx, characteristic of sharks and related fishes, through which water passes to the exterior, thereby bathing the gills. Also called branchial cleft, gill cleft.
- n. Embryology One of several rudimentary invaginations in the surface of the embryo, present during development of all air-breathing vertebrates and corresponding to the functional gill slits of aquatic species. Also called branchial groove.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An individual opening to gills, which lacks an operculum; characteristic of Cartilaginous fish such as sharks.
from the GNU version of the Collaborative International Dictionary of English
- n. See Gill opening, under Gill.
from The Century Dictionary and Cyclopedia
- n. A visceral cleft between any two visceral arches of the neck; a passage-way through gill-arches from the mouth or pharynx to the exterior; a branchial cleft.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes
Sorry, no etymologies found.