Dictionary
cir•cu•lus
Pronunciation: (sûr'kyu-lus), [key]—
n.,
—pl. -liPronunciation: (-lī"). [key]
any of the concentric circles on each scale of a fish, each of which indicates the annual growth of that scale.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.