ventricle

noun5

1. •
   Any small cavity within a body; a hollow part or organ.
2. •
   One of two lower chambers of the heart.

   • The muscular ventricles pump blood by contracting their fibers in response to electrical stimulation. — 2018
3. •
   One of four fluid-filled cavities in the brain, that are continuous with the central canal of the spinal cord.
4. •
   (no longer used) A ventriculus; especially, a stomach.
5. •
   (no longer used) The womb.