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Anatomy any small circular area, such as the pigmented ring around the human nipple or the inflamed area surrounding a pimple
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The portion of the iris bordering the pupil of the eye.
A pigmented ring surrounding a nipple, vesicle, or pustule.
A small space, interval, or pore in a tissue.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.