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Pygostyle :: Pygostyle (n.) 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 vertebrae, and supports the uropigium..

Metapterygium :: Metapterygium (n.) The posterior of the three principal basal cartilages in the fins of fishes.

Ischium :: Ischium (n.) The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.

Mesenteron :: Mesenteron (n.) All that part of the alimentary canal which is developed from the primitive enteron and is lined with hypoblast. It is distinguished from the stomod/um, a part at the anterior end of the canal, including the cavity of the mouth, and the proctod/um, a part at the posterior end, which are formed by invagination and are lined with epiblast..

Ventricle :: Ventricle (n.) A cavity, or one of the cavities, of an organ, as of the larynx or the brain; specifically, the posterior chamber, or one of the two posterior chambers, of the heart, which receives the blood from the auricle and forces it out from the heart. See Heart..

A Posteriori :: A posteriori () Applied to knowledge which is based upon or derived from facts through induction or experiment; inductive or empirical.

Telotrochous :: Telotrochous (a.) Having both a preoral and a posterior band of cilla; -- applied to the larvae of certain annelids.

Euplexoptera :: Euplexoptera (n. pl.) An order of insects, including the earwig. The anterior wings are short, in the form of elytra, while the posterior wings fold up beneath them. See Earwig..

Antitragus :: Antitragus (n.) A prominence on the lower posterior portion of the concha of the external ear, opposite the tragus. See Ear..

Procoelian :: Procoelian (a.) Concave in front; as, procoelian vertebrae, which have the anterior end of the centra concave and the posterior convex..

Obcompressed :: Obcompressed (a.) Compressed or flattened antero-posteriorly, or in a way opposite to the usual one..

Postoblongata :: Postoblongata (n.) The posterior part of the medulla oblongata.

Pylorus :: Pylorus (n.) A posterior division of the stomach in some invertebrates.

Spadix :: Spadix (n.) A special organ of the nautilus, due to a modification of the posterior tentacles..

Taxaspidean :: Taxaspidean (a.) Having the posterior tarsal scales, or scutella, rectangular and arranged in regular rows; -- said of certain birds..

Scutelliplantar :: Scutelliplantar (a.) Having broad scutella on the front, and small scales on the posterior side, of the tarsus; -- said of certain birds..

Holaspidean :: Holaspidean (a.) Having a single series of large scutes on the posterior side of the tarsus; -- said of certain birds.

Flea-beetle :: Flea-beetle (n.) A small beetle of the family Halticidae, of many species. They have strong posterior legs and leap like fleas. The turnip flea-beetle (Phyllotreta vittata) and that of the grapevine (Graptodera chalybea) are common injurious species..

Pleurotoma :: Pleurotoma (n.) Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmidae. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit..

Lacinia :: Lacinia (n.) The posterior, inner process of the stipes on the maxillae of insects..

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