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Brachium :: Brachium (n.) The upper arm; the segment of the fore limb between the shoulder and the elbow.

#NAME? :: -ment () A suffix denoting that which does a thing; an act or process; the result of an act or process; state or condition; as, aliment, that which nourishes, ornament, increment; fragment, piece broken, segment; abridgment, act of abridging, imprisonment, movement, adjournment; amazement, state of being amazed, astonishment..

Prescutum :: Prescutum (n.) The first of the four pieces composing the dorsal part, or tergum, of a thoracic segment of an insect. It is usually small and inconspicuous..

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..

Metasome :: Metasome (n.) One of the component segments of the body of an animal.

Scallop :: Scallop (n.) One of series of segments of circles joined at their extremities, forming a border like the edge or surface of a scallop shell..

Phalangoidea :: Phalangoidea (n. pl.) A division of Arachnoidea, including the daddy longlegs or harvestman (Phalangium) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheae. Called also Phalangides, Phalangidea, Phalangiida, and Opilionea..

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..

Amphiblastic :: Amphiblastic (a.) Segmenting unequally; -- said of telolecithal ova with complete segmentation.

Chlorophane :: Chlorophane (n.) The yellowish green pigment in the inner segment of the cones of the retina. See Chromophane.

Epencephalon :: Epencephalon (n.) The segment of the brain next behind the midbrain, including the cerebellum and pons; the hindbrain. Sometimes abbreviated to epen..

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

Clitellus :: Clitellus (n.) A thickened glandular portion of the body of the adult earthworm, consisting of several united segments modified for reproductive purposes..

Archiannelida :: Archiannelida (n. pl.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

Spiracle :: Spiracle (n.) One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera..

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..

Fission :: Fission (n.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self-division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division..

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

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..

Chilognatha :: Chilognatha (n. pl.) One of the two principal orders of myriapods. They have numerous segments, each bearing two pairs of small, slender legs, which are attached ventrally, near together..

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