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A gill; a respiratory organ for breathing the air contained in water, such as many aquatic and semiaquatic animals have.

A gill; a respiratory organ for breathing the air contained in water, such as many aquatic and semiaquatic animals have.

Branchiae. Gills.

The gills or respiratory organs of fishes, corresponding to the lungs of terrestrial animals.

A gill. Usually used in pi., branchiae, the branchial fissures, or gill clefts, three in number, occurring on each side of the neck of the human embryo, and entering into the development of the ear, tonsils, and jaws. [Gr.]