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

Of or pertaining to branchiæ or gills. Branchial arches, the bony or cartilaginous arches which support the gills on each side of the throat of fishes and amphibians. See Illustration in Appendix. -- Branchial clefts, the openings between the branchial arches through which water passes.

Furnished with branchiæ; as, branchiate segments.

Abranchiate.

A group of annelids, so called because the species composing it have no special organs of respiration.

Without gills.

A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. See Nudibranchiata, and Doris.

A group of Gastropoda, with limpetlike shells, including the abalone shells and keyhole limpets.

With temporary gills: -- applied to those Amphibia in which the gills do not remain in adult life.

A division of annelids in which the gills arise from or near the head. See Tubicola.

A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.

Pertaining to the bone, or cartilage, below the epibranchial in a branchial arch. -- n.

A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda.

A division of the Amphibia; the Derotremata.

Having concealed or rudimentary gills.

Having the gills around the margin of the body, as certain limpets.

A group of nudibranch mollusks without special gills.

Having the skin modified to serve as a gill.

An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. See Cephalopoda.

One of the Dibranchiata.