an antimicrobial substance, C 10 H 24 N 2 O 2 , active against susceptible bacteria of the genus Mycobacterium, in the treatment, in combination with other drugs, of tuberculosis.
ethambutol eth·am·bu·tol (ě-thām'byə-tôl', -tōl') n. An antibacterial drug used in combination with other drugs in the treatment of pulmonary tuberculosis.