Anatomy and Zoology any of various cavities or hollow organs; specif.,
a. either of the two lower chambers of the heart which receive blood from the atria and pump it into the arteries
b. any of the four small continuous cavities within the brain
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'ventricle'
ME < L ventriculus,
stomach, ventricle, dim. of venter: