Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Mathematics See sine curve.
  • n. Anatomy Any of the venous cavities through which blood passes in various glands and organs, such as the adrenal gland and the liver.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sine curve.
  • n. Any of several channels through which venous blood passes in various organs.
  • adj. sinusoidal.
  • adj. That resembles a sinus.

from the GNU version of the Collaborative International Dictionary of English

  • n. The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the curve of sines.

from The Century Dictionary and Cyclopedia

  • n. The curve of sines, in which the abscissas are proportional to an angle, and the ordinates to its sine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. tiny endothelium-lined passages for blood in the tissue of an organ
  • n. the curve of y=sin x

Etymologies

Medieval Latin sinus, sine; see sine + -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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