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Holoblastic :: Holoblastic (a.) Undergoing complete segmentation; composed entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to meroblastic..

Prothorax :: Prothorax (n.) The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

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..

Entomere :: Entomere (n.) The more granular cells, which finally become internal, in many segmenting ova, as those of mammals..

Pedate :: Pedate (a.) Palmate, with the lateral lobes cleft into two or more segments; -- said of a leaf..

Sutured :: Suture (n.) A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell..

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

Surbated :: Surbased (a.) Having the vertical height from springing line to crown less than the half span; -- said of an arch; as, a segmental arch is surbased..

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.

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..

Cant :: Cant (n.) A segment forming a side piece in the head of a cask.

Annulose :: Annulose (a.) Furnished with, or composed of, rings or ringlike segments; ringed..

Assegai :: Assegai (n.) A spear used by tribes in South Africa as a missile and for stabbing, a kind of light javelin..

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

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..

Xiphisternum :: Xiphisternum (n.) The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process..

Spider :: Spider (n.) Any one of numerous species of arachnids comprising the order Araneina. Spiders have the mandibles converted into poison fangs, or falcers. The abdomen is large and not segmented, with two or three pairs of spinnerets near the end, by means of which they spin threads of silk to form cocoons, or nests, to protect their eggs and young. Many species spin also complex webs to entrap the insects upon which they prey. The eyes are usually eight in number (rarely six), and are situated on t

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..

Protovertebra :: Protovertebra (n.) One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm..

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

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