Zoology. any of various hollow organs or parts in an animal body.
either of the two lower chambers on each side of the heart that receive blood from the atria and in turn force it into the arteries. See diag. under heart.
one of a series of connecting cavities of the brain.

1350–1400; Middle English < Latin ventriculus belly, ventricle. See venter, -i-, -cle1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ventricle (ˈvɛntrɪkəl)
1.  a chamber of the heart, having thick muscular walls, that receives blood from the atrium and pumps it to the arteries
2.  any one of the four main cavities of the vertebrate brain, which contain cerebrospinal fluid
3.  any of various other small cavities in the body
[C14: from Latin ventriculus, diminutive of venter belly]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from L. ventriculus "stomach," dim. of venter (gen. ventris) "belly" (see ventral).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ventricle ven·tri·cle (věn'trĭ-kəl)
A small cavity or chamber within a body or an organ, especially the right or left ventricle of the heart or any of the interconnecting ventricles of the brain.

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
ventricle   (věn'trĭ-kəl)  Pronunciation Key 
  1. A chamber of the heart that receives blood from one or more atria and pumps it by muscular contraction into the arteries. mammals, birds, and reptiles have two ventricles; amphibians and fish have one.

  2. Any of four fluid-filled cavities in the brain of vertebrate animals. The ventricles are filled with cerebrospinal fluid.

ventricular adjective (věn-trĭk'yə-lər)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
ventricles [(ven-tri-kuhlz)]

The two lower chambers of the heart, which receive blood from the atria and pump it into the arteries. (See circulatory system.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Its lateral margins are modified to form the highly vascular choroid plexuses of the lateral ventricles.
The atria are receiving chambers, and the ventricles distributing ones.
The ventricles are then being stimulated by more than one pacemaker.
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