TUBER

Tu″ber (?), n.[[L., a hump. knob; probably akin to tumere to swell. Cf. Tumid.]] 1. 1. (Bot.) (a) A fleshy, rounded stem or root, usually containing starchy matter, as the potato or arrowroot; a thickened root-stock. See Illust. of Tuberous. (b) A genus of fungi. See Truffle.
2. 2. (Anat.) A tuberosity; a tubercle.