Noah Webster
Zone
ZONE, noun [Latin , 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.