Webster's English Dictionary

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tubercle

tu.ber.cle \'t(y)u:-b*r-k*l\ n [L tuberculum, dim. of tuber] 1: a small 
   knobby prominence or excrescence esp. on a plant or animal : (MNODULE : as 
   1a: an eminence near the head of a rib that articulates with the transverse 
    process of a vertebra 1b: any of several prominences in the central 
   nervous system  1c: NODULE  2: a small abnormal discrete lump in the 
   substance of an organ or in the sk in; esp : the specific lesion of 
   tuberculosis