Ve´nous (L. ve´na, a vein). Pertaining to, or contained within a vein.

Ven-ti-la´tion. The introduction of fresh air into a room or building, in such a manner as to keep the air within it in a pure condition.

Ven-tril´o-quism (L. ven´ter, the belly, and lo´quor, to speak). A modification of natural speech by which the voice is made to appear to come from a distance. The ancients supposed that the voice was formed in the belly; hence the name.

Ven´tri-cles of the heart. The two largest cavities of the heart, situated at its apex or point.

Ver´te-bral Column (L. ver´tebra, a joint). The back-bone, consisting of twenty-four separate bones, called vertebræ, firmly jointed together; also called the spinal column and spine.

Ves´ti-bule. A portion of the internal ear, communicating with the semicircular canals and the cochlea; so called from its fancied resemblance to the vestibule or porch of a house.

Vil´li (L. vil´lus, the nap of cloth). Minute thread-like projections found upon the internal surface of the small intestine, giving it a velvety appearance.

Vit´re-ous (L. vi´trum, glass). Having the appearance of glass; applied to the humor occupying the largest part of the cavity of the eyeball.

Viv-i-sec´tion (L. vi´vus, alive, and se´co, to cut). The practice of operating upon living animals, for the purpose of studying some physiological process.

Vocal Cords. Two elastic bands or ridges situated in the larynx; they are the essential parts of the organs of the voice.