Definition of "ventricle"

(anatomy, zootomy) Any small cavity within a body; a hollow part or organ, especially:

1. One of two lower chambers of the heart.  quotations  examples

   Quotations

   • The muscular ventricles pump blood by contracting their fibers in response to electrical stimulation.

     2018, Sandeep Jauhar, Heart: a History, page 47

2. (neuroanatomy) One of four fluid-filled cavities in the brain, that are continuous with the central canal of the spinal cord.  quotations  examples

   Quotations

   • the ventricle of memory

     c. 1595–1596 (date written), William Shakespeare, “Loues Labour’s Lost”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene ii]

3. (archaic) The stomach.  quotations

   Quotations

   • [On birds] Where omitting the more general Properties, of having two Ventricles, and picking up stones to conveigh them into their second Ventricle, the Gizzern, (which provision and instinct is a supply for the want of teeth;) […]

     1662, Henry More, An Antidote Against Atheism, Book II: A Collection of Several Philosophical Writings of Dr. Henry More, page 72

4. (archaic) The womb.