An organ attached to various parts of the body in fishes and cetaceans, which serves for propelling and steering in the water. With prefixed…

A fin-spine of a fish. Obsolete. rare.

Zoology. = fin-ray n. at fin, n.1 compounds 2.

Any of various structures in vertebrates functioning as fins, wings, or feathers; esp. a fin of a fish; a flipper of a seal or whale. Obsolete.

Zoology. In fishes: a fin ray. Obsolete.

Ichthyology. A spinous or spiny fin-ray; a fin-spine.

Zoology. An interneural spine, bone, or plate in a fish. See sense A. 1. Usually in plural.

one of the hard spiny or soft jointed processes which support the skin of the fins.

In elasmobranch fishes: the central portion of the cartilaginous skeleton at the base of each pectoral fin.

The prominent posterior cartilage at the base of the pectoral (and sometimes pelvic) fin in certain cartilaginous fishes.

Any of the rays in a fish's fin; = radial, n. 4. Usually in plural.

A small fin.

The anterior of three principal cartilages which primitively comprise the base of each pectoral and pelvic fin in cartilaginous fishes (though in…

Zoology. A bony or cartilaginous element in a fish's fin, distal to the basal segment and supporting a fin ray. Cf. sense A. 6 and radiale, n. 3.

In fishes, one of the interspinal bones; the basal portion of a fin-ray.

in most teleost fishes the bony rays supporting the outer part of the fins.