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Any plant of the genus Polygonum.

A genus of marine annelids, believed to be an ancient or ancestral type. It is remarkable for its simplicity of structure and want of parapodia. It is the type of the order Archiannelida, or Gymnotoma. See Loeven's larva.

Like a bird's wing in form; as, a pterygoid bone.

Of or pertaining to the inner pterygoid plate, or pterygoid bone, and the lower jaw.

Of or pertaining to the pterygoid processes and the palatine bones.

A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper.

Of, pertaining to, or representing the pterygoid and quadrate bones or cartilages.

A division of opisthobranchiate mollusks having the branchiæ in a wreath or group around the anal opening, as in the genus Doris.

One of the Pygopodes.

A division of swimming birds which includes the grebes, divers, auks, etc., in which the legs are placed far back.

Of or pertaining to the Pygopodes.

The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebræ, and supports the uropigium.

Of or pertaining to both the squamosal and zygomatic bones; -- applied to a bone, or a center of ossification, in some fetal skulls. -- n.

Having fat buttocks. Specimens of the steatopygous Abyssinian breed. Burton.

Approximately polygonal; somewhat or almost polygonal.

Situated under the zygoma or zygomatic process.

Any one of several species of large sting rays belonging to Trygon and allied genera.

A division of marine gastropods in which the gills are developed on both sides of the body and the renal organs are also paired. The abalone (Haliotis) and the keyhole limpet (Fissurella) are examples.

Of or pertaining to the Zygobranchia.

Any zygodactylous bird.