Webster's English Dictionary

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tuber

Cross references:
  1. bulb                   2. corm                  
 
tu.ber \'t(y)u:-b*r\ n [L, lump, tuber, truffle; akin to L tume-re to swell 
   - more at TH]UMB 1a: a short fleshy usu. underground stem bearing minute 
   scale leaves each w ith a bud in its axil potentially able to produce a new 
   plant 1b: a fleshy root or rhizome resembling a tuber  2: an anatomical 
   prominence : TUBEROSITY