GNU Collaborative International Dictionary of English

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1.       
   Tuber , n.[L., a hump. knob; probably akin to tumere to swell. Cf. Tumid.]
   (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
   (Anat.) A tuberosity; a tubercle.
   1913 Webster