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Definitions

penicillin

[pen-uh-sil-in] / ˌpɛn əˈsɪl ɪn /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

Which is why, a few months ago, I found myself at St Mary's Hospital in London, famous for the discovery of penicillin, preparing to receive a nerve-wracking insight into my own gut health.

From BBC • Jan. 12, 2026

The doctor asked a nurse to bring some penicillin.

From "Educated" by Tara Westover




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