[an-ti-bahy-ot-ik, -bee-, an-tee-, -tahy-] 
Biochemistry, Pharmacology| 1. | any of a large group of chemical substances, as penicillin or streptomycin, produced by various microorganisms and fungi, having the capacity in dilute solutions to inhibit the growth of or to destroy bacteria and other microorganisms, used chiefly in the treatment of infectious diseases. |
| 2. | of or involving antibiotics. |
| an·ti·bi·ot·ic (ān'tĭ-bī-ŏt'ĭk, ān'tī-) n. A substance, such as penicillin or streptomycin, produced by or derived from certain fungi, bacteria, and other organisms, that can destroy or inhibit the growth of other microorganisms. Antibiotics are widely used in the prevention and treatment of infectious diseases. adj.
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A substance that destroys or inhibits the growth of microorganisms and is therefore used to treat some infections. One of the most familiar antibiotics is penicillin.
Note: Microorganisms that are initially treatable with antibiotics may evolve resistance as the more susceptible members of the population are killed off. (See resistance to antibiotics.)
antibiotic an·ti·bi·ot·ic (ān'tĭ-bī-ŏt'ĭk, ān'tī-)
n.
A substance, such as penicillin or streptomycin, produced by or derived from certain fungi, bacteria, and other organisms, that can destroy or inhibit the growth of other microorganisms. adj.
Of or relating to antibiotics.
Of or relating to antibiosis.
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