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A Posteriori :: A posteriori () Characterizing that kind of reasoning which derives propositions from the observation of facts, or by generalizations from facts arrives at principles and definitions, or infers causes from effects. This is the reverse of a priori reasoning..

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..

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..

Uvula :: Uvula (n.) The pendent fleshy lobe in the middle of the posterior border of the soft palate.

Trapezium :: Trapezium (n.) A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers..

Postcommissure :: Postcommissure (n.) A transverse commisure in the posterior part of the roof of the third ventricle of the brain; the posterior cerebral commisure.

Opisthion :: Opisthion (n.) The middle of the posterior, or dorsal, margin of the great foramen of the skull..

Opisthotic :: Opisthotic (n.) The inferior and posterior of the three elements forming the periotic bone.

Metabranchial :: Metabranchial (a.) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiae.

Platycoelian :: Platycoelian (a.) Flat at the anterior and concave at the posterior end; -- said of the centra of the vertebrae of some extinct dinouaurs.

Heteromerous :: Heteromerous (a.) Having five tarsal joints in the anterior and middle legs, but only four in the posterior pair, as the blister beetles and oil beetles..

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

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

Pygal :: Pygal (a.) Situated in the region of the rump, or posterior end of the backbone; -- applied especially to the posterior median plates in the carapace of chelonians..

Opisthopulmonate :: Opisthopulmonate (a.) Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

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

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..

Turnus :: Turnus (n.) A common, large, handsome, American swallowtail butterfly, now regarded as one of the forms of Papilio, / Jasoniades, glaucus. The wings are yellow, margined and barred with black, and with an orange-red spot near the posterior angle of the hind wings. Called also tiger swallowtail. See Illust. under Swallowtail..

Cestraciont :: Cestraciont (n.) A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples..

Pycnaspidean :: Pycnaspidean (a.) Having the posterior side of the tarsus covered with small irregular scales; -- said of certain birds.

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