ceph·​a·​lo·​spo·​rin ˌse-fə-lə-ˈspȯr-ən How to pronounce cephalosporin (audio)
: any of several antibiotics produced by an imperfect fungus (genus Acremonium synonym Cephalosporium)

Examples of cephalosporin in a Sentence

Recent Examples on the Web When taken with cephalosporin antibiotics, the body’s ability to absorb vitamin K is reduced. Allison Futterman, Discover Magazine, 16 Feb. 2024 The researchers examined which children had been given prescriptions for penicillin, penicillin with B-lactamase inhibitor, cephalosporin, sulfonamide or macrolide within the first six months of life. Jacqueline Howard, CNN, 20 Dec. 2019 Inside, the investigator found a computer running tests on ingredients for cephalosporin, an oral antibiotic used to treat bacterial infections. Katherine Eban, WIRED, 7 Aug. 2019 The superbug is resistant to beta-lactam antibiotics, a broad-spectrum group which includes methicillin as well as oxacillin and the cephalosporins. Ranjit Devraj, Quartz India, 23 July 2019 Subsequent to the transplant, the patients developed invasive infections from an E. coli strain that was resistant to a wide variety of antibiotics in the penicillin and cephalosporin groups. Beth Mole, Ars Technica, 14 June 2019 Yet, while there are many cephalosporins, only a handful have been reported to cause this reaction. Richard Klasco, New York Times, 15 June 2018 Most of these are cephalosporins, a class of broad-spectrum antibiotics that are used to treat a variety of infections. Richard Klasco, New York Times, 15 June 2018 In some cases, the results and your personal sensitivities to certain antibiotics like penicillin or cephalosporin may indicate that nitrofurantoin or trimethoprim-sulfamethoxazole are the best way to go. Korin Miller, SELF, 18 Jan. 2018 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'cephalosporin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin Cephalosporium, genus of fungi + -in entry 1

First Known Use

1951, in the meaning defined above

Time Traveler
The first known use of cephalosporin was in 1951

Dictionary Entries Near cephalosporin

Cite this Entry

“Cephalosporin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cephalosporin. Accessed 4 Mar. 2024.

Medical Definition


ceph·​a·​lo·​spo·​rin ˌsef-ə-lə-ˈspōr-ən, -ˈspȯr- How to pronounce cephalosporin (audio)
: any of several beta-lactam antibiotics produced by an imperfect fungus of the genus Acremonium or made semisynthetically

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