Defn: Divided by parallel planes; as, zonate tetraspores, found in certain red algæ.
ZONE
Zone, n. Etym: [F. zone, L. zona, Gr. j to gird, Zend yah.]
1. A girdle; a cincture. [Poetic] An embroidered zone surrounds her waist. Dryden. Loose were her tresses seen, her zone unbound. Collins.
2. (Geog.)
Defn: One of the five great divisions of the earth, with respect to latitude and temperature.
Note: The zones are five: the torrid zone, extending from tropic to tropic 46º 56min, or 23º 28min on each side of the equator; two temperate or variable zones, situated between the tropics and the polar circles; and two frigid zones, situated between the polar circles and the poles. Commerce . . . defies every wind, outrides every tempest, and invades. Bancroft.
3. (Math.)
Defn: The portion of the surface of a sphere included between two parallel planes; the portion of a surface of revolution included between two planes perpendicular to the axis. Davies & Peck (Math. Dict.)
4. (Nat. Hist.) (a) A band or stripe extending around a body. (b) A band or area of growth encircling anything; as, a zone of evergreens on a mountain; the zone of animal or vegetable life in the ocean around an island or a continent; the Alpine zone, that part of mountains which is above the limit of tree growth.
5. (Crystallog.)