Tū'ber, n.

n. [Lat. tuber, a hump, knob, probably from tumber, from tumere, to swell.]

1. (Bot.) A fleshy, rounded stem or root, usually containing starchy matter, as the potato or arrow-root; a thickened root-stock or subterraneous portion of a stem. London.
2. (Anat.) A knob or tubercle; a swelling; a knot.