from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Anatomy Any of the venous cavities through which blood passes in various glands and organs, such as the adrenal gland and the liver.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mathematics A sine curve.
  • noun anatomy Any of several channels through which venous blood passes in various organs.
  • adjective mathematics sinusoidal.
  • adjective anatomy That resembles a sinus.

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

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


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

[Medieval Latin sinus, sine; see sine + –oid.]



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