Tuber

Tuber Tu"ber, n.[L., a hump. knob; probably akin to tumere to swell. Cf. {Tumid}.] 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}. [1913 Webster]

2. (Anat.) A tuberosity; a tubercle. [1913 Webster]