tu·ber·cle 
(tbər-kəl, ty-)
(tbər-kəl, ty-)n.
1. A small rounded projecting part or outgrowth, such as a wartlike excrescence on the roots of some leguminous plants or a knoblike process in the skin or on a bone.
2. Medicine A nodule or swelling, especially a mass of lymphocytes and epithelioid cells forming the characteristic lesion of tuberculosis.
[Latin tūberculum, diminutive of tūber, lump; see TUBER.]
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