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

  • noun An organ or part, especially a tooth, having three cusps.
  • adjective Having three cusps, especially a molar tooth.
  • adjective Of or relating to the tricuspid valve.

from The Century Dictionary.

  • Having three cusps or points: specifically noting the valvular arrangement in the right ventricle of the heart, guarding the auriculoventricular orifice, in distinction from the bicuspid (or mitral) valves in the left ventricle.
  • noun A tricuspid valve of the heart.
  • noun A tricuspid tooth: correlated with bicuspid and multicuspid.

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

  • adjective Having three cusps, or points; tricuspidate.
  • adjective (Anat.) Of or pertaining to the tricuspid valves.
  • adjective (Anat.) the valve, consisting of three triangular membranous flaps, at the opening of the right auricle into the right ventricle in the heart of most mammals; -- sometimes called the tricuspid valves, each flap being regarded as a valve.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Having three cusps
  • noun A molar tooth that has three cusps

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

  • adjective having three cusps or points (especially a molar tooth)


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

[From Latin tricuspis, tricuspid-, having three points : tri-, tri- + cuspis, point.]


  • The valve on the right side is called the tricuspid, because it consists of three little folds which fall over the opening and close it, being kept from falling too far by a number of slender threads called chordæ tendinæ.

    A Practical Physiology

  • The pulsation may be described as tricuspid; that is, it consists of a strong beat, preceded and followed by lesser beats.

    Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics

  • The valve which guards the entrance into the right ventricle is called tricuspid, and consists of three flaps attached by delicate tendinous cords in such a way as to hinder the tending backwards of the flaps into the right auricle, and so allowing the blood to flow back into that chamber.

    The Common Frog

  • Not all babies with tricuspid atresia require prostaglandin.

    Tricuspid Atresia

  • Some babies with tricuspid atresia are too “pink” or have too much blood-flow to the lungs, and will require an operation called “pulmonary artery banding” to narrow the pulmonary artery and regulate blood flow to the lungs.

    Tricuspid Atresia

  • Children with tricuspid atresia always have an atrial septal defect, a hole between the right atrium and left atrium, so that oxygen-poor and oxygen-rich blood (blue and pink blood) mix inside of the heart.

    Tricuspid Atresia

  • Single ventricle defects include hypoplastic left heart syndrome, tricuspid atresia, double inlet left ventricle, some heterotaxy defects and others.

    Single Ventricle Heart Defects

  • Any of the above operations may also have to include replacement of the leaky tricuspid valve with an artificial valve, and insertion of a pacemaker.

    Congenitally Corrected Transposition of the Great Arteries (CCTGA)

  • An abnormal valve that tends to leak (Doctors call this an “Ebstein-like” tricuspid valve.)

    Congenitally Corrected Transposition of the Great Arteries (CCTGA)

  • In a normal heart, two valves separate the upper and lower chambers of the heart: the tricuspid valve separates the right chambers and the mitral valve the left.

    Atrioventricular Canal Defects


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