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

Meroblastic :: Meroblastic (a.) Consisting only in part of germinal matter; characterized by partial segmentation only; as, meroblastic ova, in which a portion of the yolk only undergoes fission; meroblastic segmentation; -- opposed to holoblastic..

Mesencephalon :: Mesencephalon (n.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain.

Hyomandibular :: Hyomandibular (a.) Pertaining both to the hyoidean arch and the mandible or lower jaw; as, the hyomandibular bone or cartilage, a segment of the hyoid arch which connects the lower jaw with the skull in fishes..

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..

Welwitschia :: Welwitschia (n.) An African plant (Welwitschia mirabilis) belonging to the order Gnetaceae. It consists of a short, woody, topshaped stem, and never more than two leaves, which are the cotyledons enormously developed, and at length split into diverging segments..

Segment :: Segment (n.) One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation..

Somite :: Somite (n.) One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is is composed; somatome; metamere..

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

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..

Blastide :: Blastide (n.) A small, clear space in the segments of the ovum, the precursor of the nucleus..

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..

Tubicolae :: Tubicolae (n. pl.) A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella..

Manus :: Manus (n.) The distal segment of the fore limb, including the carpus and fore foot or hand..

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

Internode :: Internode (n.) A part between two joints; a segment; specifically, one of the phalanges..

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..

Moonwort :: Moonwort (n.) Any fern of the genus Botrychium, esp. B. Lunaria; -- so named from the crescent-shaped segments of its frond..

Mesosternum :: Mesosternum (n.) The ventral piece of the middle segment of the thorax in insects.

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..

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