The backbone of a fish.

Anatomy and Zoology. A pharyngeal blood vessel, nerve, or (in a fish) bone.

Zoology. A bone in the lower part of the operculum of a fish; = subopercular, n. Cf. operculum, n. 1b.

A small bone situated above the temporal bone in the skull of certain fishes and reptiles. Cf. supertemporal, n.2

(a) a joint in the form of a shackle (sense 6), esp. one for adjusting the tension of rods, wires, etc.; (b) a peculiar kind of articulation in the…

The mastoid process or bone.

Comparative Anatomy. A part or joint analogous or answering to the wrist in man. Ichthyology. (See first quot.)

the posterior portion of the temporal bone in humans and other mammals, which includes the mastoid process. Formerly also: †designating any of…

A subopercular bone; = suboperculum, n. 1.

Ichthyology. The symplectic bone. Obsolete.

In fishes and some amphibians and reptiles: a bone or cartilage in the upper or anterior part of the pectoral girdle.

plural. The lower portion of the branchial arch.

(a) adj. situated beneath the tympanum; applied esp. to the lower bone of the jaw-pier in osseous fishes; (b) n. the quadrate.

The bone forming this.

Anatomy and Zoology. The slightly shorter of the two bones of the forearm in humans (on the same side as the thumb), which articulates with the…

Zoology. In a teleostean fish: a bone, cartilage, or ligament attached to a vertebra (often to the centrum) and located in the horizontal septum…

A bone in the upper posterior part of the skull in many fishes and some other lower vertebrates, often bearing a distinct crest or flange; a…

In some teleostean fishes: a bone situated between and bridging the hypercoracoid and hypocoracoid bones.

In some fishes: a bone of the pectoral girdle situated above the clavicle.

A bone or cartilage in certain fishes, amphibians, reptiles, and birds, situated anterior to and sometimes fused with the coracoid bone of the…

Anatomy and Zoology. The symplectic bone.

Situated beneath the tail; spec. in Ichthyology applied to the bones beneath the axis of the tail, which support fin-rays. Also absol. as n.

Ichthyology. A thin bony lamina in the skull of teleostean fishes which fits against the upper edge of the pterygoid bone.

A post-temporal bone.

In most bony fishes: each of one or more bones forming the posterior part of the pectoral girdle, lying behind, and partly overlapped by, the…

Zoology. One of a series of bones in fishes to which the pectoral fins are attached.

The posterior unsegmented portion of the vertebral column in certain fishes and amphibians.

The upper of the two bones forming the shoulder-girdle in typical fishes, with which the fin-rays articulate; the scapula.

In the skull of certain fishes: a bone attached to or associated with the upper edge of the maxillary. Now rare or disused.

An element found between adjacent neural arches in the vertebral column of elasmobranchs and certain other fishes.

(a) adj. relating to or consisting of the palatine, pterygoid, and quadrate bones or cartilages; (b) n. a bone of the upper jaw of some vertebrates…

A bone of the skull in certain fishes (probably the alisphenoid). Obsolete. rare.

Zoology. Designating a set of structures, including a chain of small bones, which, in certain teleost fishes, connect the swim bladder with the…

Zoology. Designating a set of structures, including a chain of small bones, which, in certain teleost fishes, connect the swim bladder with the…

Zoology. Cuvier's name for: the scapula of a fish. Obsolete. rare.

In some fishes and amphibians: a bone of the pectoral girdle situated dorsal to the cleithrum.