ampicillin

noun
am·​pi·​cil·​lin | \ ˌam-pə-ˈsi-lən How to pronounce ampicillin (audio) \

Definition of ampicillin

: a penicillin C16H19N3O4S that is effective against gram-negative and gram-positive bacteria and is used to treat various infections of the urinary, respiratory, and intestinal tracts

Examples of ampicillin in a Sentence

Recent Examples on the Web In their search, a few other antibiotics were associated with contraceptive failure in three or more case reports, including: ampicillin, amoxicillin, griseofulvin, metronidazole, and tetracycline. Korin Miller, SELF, 27 July 2017 The unidentified infant had contracted group B Streptococcus agalactiae (GBS) during birth and was given an 11-day course of ampicillin, according to a CDC newsletter, which detailed the case. Fox News, 30 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ampicillin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ampicillin

1961, in the meaning defined above

History and Etymology for ampicillin

am(ino) + p(en)icillin

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Time Traveler for ampicillin

Time Traveler

The first known use of ampicillin was in 1961

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Cite this Entry

“Ampicillin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ampicillin. Accessed 14 Jun. 2021.

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More Definitions for ampicillin

ampicillin

noun
am·​pi·​cil·​lin | \ ˌam-pə-ˈsil-ən How to pronounce ampicillin (audio) \

Medical Definition of ampicillin

: a penicillin C16H19N3O4S that is effective against gram-negative and gram-positive bacteria and is used in anhydrous forms, as the trihydrate, or as the sodium salt to treat various infections of the urinary, respiratory, and intestinal tracts — see penbritin

More from Merriam-Webster on ampicillin

Britannica.com: Encyclopedia article about ampicillin

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