ZONE, n. [L., Gr.] 1. A girdle.An embroiderd zone surrounds her waist.2. In geography, a division of the earth, with respect to the temperature of different latitudes. The zones are five; the torrid zone, extending from tropic to tropic 46 degrees, 56 degrees, or 23 degrees 28' on each side of the equator; two temperate or variable zones, situated between the tropics and polar circles; and two frigid zones, situated between the polar circles and the poles.3. Circuit; circumference.Ciliary zone, in anatomy, the black impression of the ciliary processes on the vitreous humor of the eye.
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