In a manner relating to or using antibiotics; in a way that kills or suppresses microorganisms.
From antibiotic (from anti- + biotic, from Greek bios, life) + -ally (forming adverbs). Antibiotic entered English in the 1940s when penicillin was developed; the adverb form followed naturally.
Antibiotically treating infections revolutionized medicine—penicillin saved millions of lives starting in WWII! But we're now paying the price with antibiotic-resistant bacteria because we overused them for things like feeding farm animals.
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