circulus

[sur-kyuh-luh s]
noun, plural cir·cu·li [-lahy] /-ˌlaɪ/.
  1. any of the concentric circles on each scale of a fish, each of which indicates the annual growth of that scale.

Origin of circulus

< Latin: circle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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circulus in Medicine

circulus

[sûrkyə-ləs]
n. pl. cir•cu•li (-lī′)
  1. A ringlike or circular structure.
  2. A circle formed by connecting arteries, veins, or nerves.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.