What is the meaning of Ventricle?

Any small cavity within a body; a hollow part or organ, especially:

  1. One of two lower chambers of the heart.

    One of two lower chambers of the heart.

    One of four fluid-filled cavities in the brain, that are continuous with the central canal of the spinal cord.

    A ventriculus; especially, a stomach.

    The womb.

    Source: wiktionary.org