Mycobacterium tuberculosis

Mycobacterium tuberculosis
Tubercle Tu"ber*cle, n. [L. tuberculum, dim. of tuber: cf. F. tubercule, OF. also tubercle. See {Tuber}.] [1913 Webster] 1. A small knoblike prominence or excrescence, whether natural or morbid; as, a tubercle on a plant; a tubercle on a bone; the tubercles appearing on the body in leprosy. [1913 Webster]

2. (Med.) A small mass or aggregation of morbid matter; especially, the deposit which accompanies scrofula or phthisis. This is composed of a hard, grayish, or yellowish, translucent or opaque matter, which gradually softens, and excites suppuration in its vicinity. It is most frequently found in the lungs, causing consumption. [1913 Webster]

{Tubercle bacillus} (Med.), a minute vegetable organism ({Mycobacterium tuberculosis}, formerly {Bacillus tuberculosis}, and also called {Koch's bacillus}) discovered by Koch, a German physician, in the sputum of consumptive patients and in tuberculous tissue. It is the causative agent of tuberculosis. [1913 Webster +PJC]

The Collaborative International Dictionary of English. 2000.

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