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The postero-inferior opercular bone, in fishes.

The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.

A black, two-horned, African rhinoceros (Atelodus keitloa). It has the posterior horn about as long as the anterior one, or even longer.

A small postern or gate in a palisade, for the passage of sallying parties. [Written also klinket.]

most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum).

The posterior, inner process of the stipes on the maxillæ of insects.

scribed in Gulliver's Travels as the home of chimerical philosophers. Hence, fanciful; preposterous; absurd in science or philosophy. "Laputan ideas." G. Eliot.

At a point of duration far distant, either prior or posterior; as, not long before; not long after; long before the foundation of Rome; long after the Conquest.

ertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha.

em or branch of a plant; pith. Medulla oblongata. Etym: [L., oblong medulla] (Anat.), the posterior part of the brain connected with the spinal cord. It includes all the hindbrain except the cerebellum and pons, and from it a large part of the cranial nerves arise. It controls very largely respiration, circulation, swa…

erior end of the canal, including the cavity of the mouth, and the proctod, a part at the posterior end, which are formed by invagination and are lined with epiblast.

Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiæ.

Of or pertaining to the two posterior gastric lobes of the carapace of crabs.

The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.

The posterior division of the foot in the Gastropoda and Pteropoda.

The posterior of the three principal basal cartilages in the fins of fishes. -- Me*tap`ter*yg"i*al, a.

The most posterior element of the sternum; the ensiform process; xiphisternum.

The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

The posterior part of the brain, including the medulla; the afterbrain. Sometimes abbreviated to meten.

The postero-lateral ossification in the sternum of birds; also, the part resulting from such ossification.