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tu·ber·cu·lin / t(y)oōˈbərkyəlin/ • n. a sterile protein extract from cultures of tubercle bacillus, used in a test by hypodermic injection for infection with or immunity to tuberculosis, and also formerly in the treatment of the disease.
tuberculin (tew-ber-kew-lin) n. a protein extract from cultures of tubercle bacilli, used to test whether a person has suffered from or been in contact with tuberculosis (see Mantoux test).
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