English definition of Segment

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Definition of segment

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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..

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Epihyal :: Epihyal (n.) A segment next above the ceratohyal in the hyoidean arch.

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..

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

Merosome :: Merosome (n.) One of the serial segments, or metameres, of which the bodies of vertebrate and articulate animals are composed..

Spindling :: Spindleworm (n.) The larva of a noctuid mmoth (Achatodes zeae) which feeds inside the stalks of corn (maize), sometimes causing much damage. It is smooth, with a black head and tail and a row of black dots across each segment..

Xanthophane :: Xanthophane (n.) The yellow pigment present in the inner segments of the retina in animals. See Chromophane.

Proglottis :: Proglottis (n.) One of the free, or nearly free, segments of a tapeworm. It contains both male and female reproductive organs, and is capable of a brief independent existence..

Midbrain :: Midbrain (n.) The middle segment of the brain; the mesencephalon. See Brain.

Morula :: Morula (n.) The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; -- called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation..

Morulation :: Morulation (n.) The process of cleavage, or segmentation, of the ovum, by which a morula is formed..

Glowworm :: Glowworm (n.) A coleopterous insect of the genus Lampyris; esp., the wingless females and larvae of the two European species (L. noctiluca, and L. splendidula), which emit light from some of the abdominal segments..

Cone :: Cone (v. t.) To render cone-shaped; to bevel like the circular segment of a cone; as, to cone the tires of car wheels..

Scallop :: Scallop (v. t.) To mark or cut the edge or border of into segments of circles, like the edge or surface of a scallop shell. See Scallop, n., 2..

Segment :: Segment (n.) A piece in the form of the sector of a circle, or part of a ring; as, the segment of a sectional fly wheel or flywheel rim..

Metamere :: Metamere (n.) One of successive or homodynamous parts in animals and plants; one of a series of similar parts that follow one another in a vertebrate or articulate animal, as in an earthworm; a segment; a somite. See Illust. of Loeven's larva..

Manitrunk :: Manitrunk (n.) The anterior segment of the thorax in insects. See Insect.

Multifid :: Multifid (a.) Having many segments; cleft into several parts by linear sinuses; as, a multifid leaf or corolla..

Pronucleus :: Pronucleus (n.) One of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum.

Thoracica :: Thoracica (n. pl.) A division of cirripeds including those which have six thoracic segments, usually bearing six pairs of cirri. The common barnacles are examples..

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..