1.NounA 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.
"the iliac tubercles"
2.NounA small rounded wartlike protuberance of the roots of some leguminous plants; the lip of certain orchids, cacti.
3.NounA small rounded nodule forming the characteristic lesion of tuberculosis.