| a scrap or morsel of food left at a meal. |
| a chattering or flighty, light-headed person. |
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.
| antibiotic (ān'tĭ-bī-ŏt'ĭk) Pronunciation Key
Noun A substance, such as penicillin, that is capable of destroying or weakening certain microorganisms, especially bacteria or fungi, that cause infections or infectious diseases. Antibiotics are usually produced by or synthesized from other microorganisms, such as molds. They inhibit pathogens by interfering with essential intracellular processes, including the synthesis of bacterial proteins. Antibiotics do not kill viruses and are not effective in treating viral infections. Adjective
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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.)