Daily Almanac for
Feb 10, 2010
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si•nus



Pronunciation: (sī'nus), [key]
n.,
pl. -nus•es.

1. a curve; bend.
2. a curving part or recess.
3. Anat.
a. any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.
b. one of the hollow cavities in the skull connecting with the nasal cavities.
c. an expanded area in a canal or tube.
4. Pathol.a narrow passage leading to an abscess or the like.
5. Bot.a small, rounded depression between two projecting lobes, as of a leaf.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

sinuousSinus Iridum
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