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Definitions

penicillin

[pen-uh-sil-in] / ˌpɛn əˈsɪl ɪn /


Example Sentences

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Some important drugs, including penicillin, rely on small ring-shaped molecules that store large amounts of internal tension.

From Science Daily • May 20, 2026

Alexander Fleming discovered penicillin after mould accidentally contaminated a laboratory dish and killed surrounding bacteria.

From Science Daily • Mar. 14, 2026

Common problems that could have been treated with an office visit and a few penicillin pills will blossom into heart-valve infections and organ failure.

From MarketWatch • Jan. 26, 2026

The U.K. has long been a powerhouse in drug discovery, from the 1928 penicillin breakthrough to the landmark Oxford-AstraZeneca Covid-19 vaccine in 2020.

From The Wall Street Journal • Dec. 1, 2025

“I can give you penicillin for the strep, but there’s not much I can do for the mono. You’ll have to wait it out. Still, once we’ve cleared out the strep, you should feel better.”

From "Educated" by Tara Westover




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