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Presternum :: Presternum (n.) The anterior segment of the sternum; the manubrium.

Desegmentation :: Desegmentation (n.) The loss or obliteration of division into segments; as, a desegmentation of the body..

Diplopoda :: Diplopoda (n. pl.) An order of myriapods having two pairs of legs on each segment; the Chilognatha.

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Division :: Division (n.) The portion separated by the divining of a mass or body; a distinct segment or section.

Segment :: Segment (v. i.) To divide or separate into parts in growth; to undergo segmentation, or cleavage, as in the segmentation of the ovum..

Segment :: Segment (n.) A segment gear.

Segment :: Segment (n.) A part cut off from a figure by a line or plane; especially, that part of a circle contained between a chord and an arc of that circle, or so much of the circle as is cut off by the chord; as, the segment acb in the Illustration..

Epipharyngeal :: Epipharyngeal (a.) Pertaining to the segments above the epibranchial in the branchial arches of fishes.

Glossohyal :: Glossohyal (a.) Pertaining to both the hyoidean arch and the tongue; -- applied to the anterior segment of the hyoidean arch in many fishes. -- n. The glossohyal bone or cartilage; lingual bone; entoglossal bone.

Metathorax :: Metathorax (n.) The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

Segmentation :: Segmentation (n.) The act or process of dividing into segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation..

Osmaterium :: Osmaterium (n.) One of a pair of scent organs which the larvae of certain butterflies emit from the first body segment, either above or below..

Arthrostraca :: Arthrostraca (n. pl.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda..

Strobila :: Strobila (n.) A form of the larva of certain Discophora in a state of development succeeding the scyphistoma. The body of the strobila becomes elongated, and subdivides transversely into a series of lobate segments which eventually become ephyrae, or young medusae..

Cestoidea :: Cestoidea (n. pl.) A class of parasitic worms (Platelminthes) of which the tapeworms are the most common examples. The body is flattened, and usually but not always long, and composed of numerous joints or segments, each of which may contain a complete set of male and female reproductive organs. They have neither mouth nor intestine. See Tapeworm..

Stylohyoid :: Stylohyal (n.) A segment in the hyoidean arch between the epihyal and tympanohyal.

Mesothorax :: Mesothorax (n.) The middle segment of the thorax in insects. See Illust. of Coleoptera.

Myotome :: Myotome (n.) One of the embryonic muscular segments arising from the protovertebrae; also, one of the protovertebrae themselves..

Procerite :: Procerite (n.) The segment next to the flagellum of the antennae of Crustacea.

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