a. (Zool.) Abranchiate. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. 'a priv. + &unr_;, pl., the gills of fishes. ] (Zool.) A group of annelids, so called because the species composing it have no special organs of respiration. [ 1913 Webster ]

a. (Zool.) Without gills. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. 'a`nqos flower + &unr_; gills, n. pl. ] (Zool.) 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. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. &unr_;, &unr_;, shield + &unr_; gills. ] (Zool.) A group of Gastropoda, with limpetlike shells, including the abalone shells and keyhole limpets. [ 1913 Webster ]

‖n.; pl. Branchiæ [ L., fr. Gr. &unr_;, pl. of &unr_;. ] (Anat.) A gill; a respiratory organ for breathing the air contained in water, such as many aquatic and semiaquatic animals have. [ 1913 Webster ]

a. (Anat.) Of or pertaining to branchiæ or gills. [ 1913 Webster ]

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. [ 1913 Webster ]

a. (Anat.) Furnished with branchiæ; as, branchiate segments. [ 1913 Webster ]

a. [ L. caducus falling (fr. cadere to fall) + E. branchiate. ] (Zool.) With temporary gills: -- applied to those Amphibia in which the gills do not remain in adult life. [ 1913 Webster ]

‖n. pl. [ NL., from L. caput, capitis, head + -branchiae gills. ] (Zool.) A division of annelids in which the gills arise from or near the head. See Tubicola. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. ke`ras, ke`ratos, horn + &unr_;, n. pl., gills. ] (Zool.) A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills. [ 1913 Webster ]

a. (Anat.) Pertaining to the bone, or cartilage, below the epibranchial in a branchial arch. -- n. A ceratobranchial bone, or cartilage. [ 1913 Webster ]

‖n. pl. [ NL., fr. E. cirrus + L. branchiae gills. ] (Zool.) A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. krypto`s hidden + L. branchia a gill. ] (Zool.) (a) A division of the Amphibia; the Derotremata. (b) A group of nudibranch mollusks. [ 1913 Webster ]

a. (Zool.) Having concealed or rudimentary gills. [ 1913 Webster ]

a. [ Cyclo- + branchiate. ] (Zool) Having the gills around the margin of the body, as certain limpets. [ 1913 Webster ]

‖n. pl. [ NL. ] (Zool.) A group of nudibranch mollusks without special gills. [ 1913 Webster ]

a. [ Derm + branchiate. ] (Zool.) Having the skin modified to serve as a gill. [ 1913 Webster ]

n. 1. comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish).
Syn. -- Dibranchiata, subclass ta, Dibranchia, subclass Dibranchia. [ WordNet 1.5 ]

‖n. pl. [ NL., fr. Gr. di- = di`s- twice + &unr_; gills. ] (Zool.) 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. [ 1913 Webster ]

a. (Zool.) Having two gills. -- n. One of the Dibranchiata. [ 1913 Webster ]

‖n. pl. [ NL., from L. dorsum back + branchiae gills. ] (Zool.) A division of chætopod annelids in which the branchiæ are along the back, on each side, or on the parapodia. [ See Illusts. under Annelida and Chætopoda. ] [ 1913 Webster ]

a. (Zool.) Having branchiæ along the back; belonging to the Dorsibranchiata. -- n. One of the Dorsibranchiata. [ 1913 Webster ]

a. (Zoöl.) Of or pertaining to Elasmobranchii. -- n. One of the Elasmobranchii. [ 1913 Webster ]

a. [ Pref. epi- + branchial. ] (Anat.) Pertaining to the segment between the ceratobranchial and pharyngobranchial in a branchial arch. -- n. An epibranchial cartilage or bone. [ 1913 Webster ]

a. (Anat.) Outside of the branchial arches; -- said of the cartilages thus placed in some fishes. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. "y`dwr water + &unr_; gills.] (Zool.) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate a. [ 1913 Webster ]

a. [ Pref. hypo- + branchial. ] (Anat.) Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch. -- n. A hypobranchial bone or cartilage.

n. (Zool.) One of the Inferobranchiata. [ 1913 Webster ]

n. pl. [ NL. See Inferobranchiate. ] (Zool.) A suborder of marine gastropod mollusks, in which the gills are between the foot and the mantle. [ 1913 Webster ]

a. [ L. inferus lower + E. branchiate. ] (Zool.) Having the gills on the sides of the body, under the margin of the mantle; belonging to the Inferobranchiata. [ 1913 Webster ]

a. [ Infra + branchial. ] (Zool.) Below the gills; -- applied to the ventral portion of the pallial chamber in the lamellibranchs. [ 1913 Webster ]

a. (Zool.) Between the branchiæ. [ 1913 Webster ]

{ ‖‖ } n. pl. [ NL. See lamella, and Branchia, Branchiate. ] (Zool.) An earlier name for the class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc., now called Pelecypoda or Bivalvia. [ 1913 Webster +PJC ]

☞ They usually have two (rarely but one) flat, lamelliform gills on each side of the body. They have an imperfectly developed head, concealed within the shell, whence they are called Acephala. Called also Conchifera, and Pelecypoda. See Bivalve. [ 1913 Webster ]

a. (Zool.) Having lamellar gills; belonging to the Lamellibranchia (also called Pelecypoda). -- n. One of the Lamellibranchia (also called Pelecypoda). [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Lophobranchii. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. &unr_; a pouch + &unr_; a gill. ] (Zool.) A class of Vertebrata, lower than fishes, characterized by their purselike gill cavities, cartilaginous skeletons, absence of limbs, and a suckerlike mouth destitute of jaws. It includes the lampreys and hagfishes. See Cyclostoma, and Lamprey. Called also Marsipobranchiata, and Marsipobranchii. [ 1913 Webster ]

a. [ Meso- + branchial. ] (Zool.) Of or pertaining to a region of the carapace of a crab covering the middle branchial region. [ 1913 Webster ]

a. [ Meta- + branchial. ] (Zool.) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiae. [ 1913 Webster ]

‖n. pl. [ NL. See Notum, and Branchia. ] (Zool.) (a) A division of nudibranchiate mollusks having gills upon the back. (b) The Dorsibranchiata. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Notobranchiata. [ 1913 Webster ]

‖n. pl. [ NL. See Nucleus, and Branchia ] (Zool.) See Heteropoda. [ 1913 Webster ]

‖n. pl. [ NL. See Nude, and Branchia. ] (Zool.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia. [ 1913 Webster ]

a. & n. (Zool.) Same as Nudibranch. [ 1913 Webster ]

{ ‖ } n. pl. [ NL., from Gr. 'o`pisqen behind + &unr_; gills. ] (Zool.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Opisthobranchiata. -- n. One of the Opisthobranchiata. [ 1913 Webster ]

‖n. pl. [ NL. ] (Zool.) Same as Brachiopoda. [ 1913 Webster ]

a. [ See Pallium, and Branchia. ] (Zool.) Having the pallium, or mantle, acting as a gill, as in brachiopods. [ 1913 Webster ]

‖n. pl. [ NL. See Pecten, and Branchia. ] (Zool.) A division of Gastropoda, including those that have a comblike gill upon the neck. [ 1913 Webster ]

a. [ L. pecten, -inis, a comb + E. branchiate. ] (Zool.) Having pectinated gills. [ 1913 Webster ]