tubercle

noun3

1. •
   A round nodule, small eminence, or warty outgrowth, especially those found on bones for the attachment of a muscle or ligament or small elevations on the surface of a tooth.
2. •
   A small rounded wartlike protuberance of the roots of some leguminous plants; the lip of certain orchids, cacti.
3. •
   A small rounded nodule forming the characteristic lesion of tuberculosis.