Also, tricuspidal. having three cusps or points, as a tooth. Compare bicuspid.
Anatomy. of, pertaining to, or affecting the tricuspid valve.
Anatomy. a tricuspid part, as a tooth.

1660–70; < Latin tricuspid- (stem of tricuspis) having three points. See tri-, cuspid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tricuspid (traɪˈkʌspɪd)
1.  a.  having three points, cusps, or segments: a tricuspid tooth; a tricuspid valve
 b.  of or relating to such a tooth or valve
2.  a tooth having three cusps

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American Heritage
Medical Dictionary

tricuspid tri·cus·pid (trī-kŭs'pĭd)
An organ or a part, especially a tooth, having three cusps. adj. or tri·cus·pi·dal (-pĭ-dəl) or tri·cus·pi·date (-pĭ-dāt')

  1. Having three points, prongs, or cusps.

  2. Of or relating to the tricuspid valve.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
tricuspid   (trī-kŭs'pĭd)  Pronunciation Key 
Adjective   Having three points or cusps.

  1. A tooth having three points or cusps, especially a molar.

  2. See tricuspid valve.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The tricuspid valve is found between the upper and lower chambers on the right side of the heart.
Persons with pulmonary atresia may also have a poorly developed tricuspid valve.
The tricuspid regulates blood flow between the right atrium and the right ventricle.
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