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Articulate :: Articulate (a.) Jointed; formed with joints; consisting of segments united by joints; as, articulate animals or plants..

Protopodite :: Protopodite (n.) The basal portion, or two proximal and more or less consolidated segments, of an appendage of a crustacean..

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..

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..

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

Spheromere :: Spheromere (n.) Any one of the several symmetrical segments arranged around the central axis and composing the body of a radiate anmal.

Trisected :: Trisected (a.) Divided into three parts or segments by incisions extending to the midrib or to the base; -- said of leaves.

Syzygy :: Syzygy (n.) Any one of the segments of an arm of a crinoid composed of two joints so closely united that the line of union is obliterated on the outer, though visible on the inner, side..

Catadromous :: Catadromous (a.) Having the lowest inferior segment of a pinna nearer the rachis than the lowest superior one; -- said of a mode of branching in ferns, and opposed to anadromous..

Chromophane :: Chromophane (n.) A general name for the several coloring matters, red, green, yellow, etc., present in the inner segments in the cones of the retina, held in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina..

Iulus :: Iulus (n.) A genus of chilognathous myriapods. The body is long and round, consisting of numerous smooth, equal segments, each of which bears two pairs of short legs. It includes the galleyworms. See Chilognatha..

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..

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

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..

Leptocardia :: Leptocardia (n. pl.) The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colorless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See Amphioxus..

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..

Urite :: Urite (n.) One of the segments of the abdomen or post-abdomen of arthropods.

Arch :: Arch (n.) Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed..

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

Epimere :: Epimere (n.) One of the segments of the transverse axis, or the so called homonymous parts; as, for example, one of the several segments of the extremities in vertebrates, or one of the similar segments in plants, such as the segments of a segmented leaf..

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