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[am-puh-sil-in] /ˌæm pəˈsɪl ɪn/
noun, Pharmacology.
a broad-spectrum semisynthetic penicillin, C 16 H 19 N 3 O 4 S, effective against certain susceptible Gram-positive and Gram-negative bacteria.
Origin of ampicillin
1965-70; probably am(inobenzyl)p(en)icillin, an alternate chemical name Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ampicillin


a semisynthetic penicillin used to treat various infections
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ampicillin in Medicine

ampicillin am·pi·cil·lin (ām'pĭ-sĭl'ĭn)
A semisynthetic of penicillin effective against gram-negative and gram-positive bacteria and used in treating infections of the intestinal, urinary, and respiratory tracts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ampicillin in Science
An antibiotic derived from penicillin that has a broad antibacterial spectrum of action. It is effective against gram-negative and gram-positive bacteria and is used primarily to treat gonorrhea and infections of the respiratory, urinary, and intestinal tracts.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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