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naturally separates or is divided; a part divided or cut off; a section; a portion; as, a segment of an orange; a segment of a compound or divided leaf.

Relating to, or being, a segment.

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. Segmentation cavity (Biol.), the cavity formed by the arrangement of the cells in segmentation or cleavage of the ovum; the cavity of th…

Divided into segments or joints; articulated.

One of tow equal parts of a line, or other magnitude.

The loss or obliteration of division into segments; as, a desegmentation of the body.

One of the radial segments composing the body of one of the Coelenterata.

Applied to those ova which segment uniformly, and which have little or no food yelk embedded in their protoplasm. Balfour.

The segment of the body of an insect to which the wings are attached; the thorax. Kirby.

Segmenting unequally; -- said of telolecithal ova with complete segmentation.

Tending upwards; -- said of terns in which the lowest secondary segments are on the upper side of the branch of the central stem. D. C. Eaton.

r ratio of four points abcd on a straight line is the quantity (ac/ad):(bc/bd), where the segments are to regarded as plus or minus, according to the order of the letters.

A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See Chætopoda.

Furnished with, or composed of, rings or ringlike segments; ringed.

urve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.

A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

One of the body segments of Arthropods. See Arthrostraca. Packard.

e of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.

One of the segments of an articulated appendage. Articles of Confederation, the compact which was first made by the original thirteen States of the United States. They were adopted March 1, 1781, and remained the supreme law until March, 1789. -- Articles of impeachment, an instrument which, in cases of impeachment, p…

Jointed; formed with joints; consisting of segments united by joints; as, articulate animals or plants.