Segment /(?)/

Seg·ment

Segment

n.
  1. One of the parts into which any body 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.
  2. 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. (Geom.)
  3. 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. (Mach.)
  4. One of the cells or division formed by segmentation, as in egg cleavage or in fissiparous cell formation. (Biol.)

Phrases & Compounds
Segment gear
a piece for receiving or communicating reciprocating motion from or to a cogwheel, consisting of a sector of a circular gear, or ring, having cogs on the periphery, or face.
Segment of a line
the part of a line contained between two points on it.
Segment of a sphere
the part of a sphere cut off by a plane, or included between two parallel planes.
Ventral segment
See Loor, n., 5.

Segment

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