Etymology
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antibiotic (adj.)

"destructive to micro-organisms," 1894, from French antibiotique (c. 1889), from anti- "against" (see anti-) + biotique "of (microbial) life," from Late Latin bioticus "of life" (see biotic). As a noun, first recorded 1941 in works of U.S. microbiologist Selman Waksman (1888-1973), discoverer of streptomycin. Earlier the adjective was used in a sense "not from living organisms" in debates over the origins of certain fossils (1860).

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Definitions of antibiotic
1
antibiotic (n.)
a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections;
when antibiotics were first discovered they were called wonder drugs
Synonyms: antibiotic drug
2
antibiotic (adj.)
of or relating to antibiotic drugs;
From wordnet.princeton.edu