circuli

circulus

[sur-kyuh-luhs]
noun, plural circuli [-lahy] .
any of the concentric circles on each scale of a fish, each of which indicates the annual growth of that scale.

Origin:
< Latin: circle

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Medical Dictionary

circulus cir·cu·lus (sûr'kyə-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
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