The Collaborative International Dictionary of English v.0.48:

Tuberosity \Tu`ber*os"i*ty\, n.; pl. Tuberosities. [Cf. F.
   tub['e]rosit['e].]
   1. The state of being tuberous.
      [1913 Webster]

   2. An obtuse or knoblike prominence; a protuberance.
      [1913 Webster]