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[bas-i-trey-sin] /ˌbæs ɪˈtreɪ sɪn/
noun, Pharmacology.
an antibiotic polypeptide derived by the hydrolytic action of Bacillus subtilis on protein, primarily used topically in the treatment of superficial infections caused by susceptible Gram-positive organisms.
Origin of bacitracin
1940-45; baci(llus) + (Margaret) Trac(y) (born 1936), American child whose tissues were found to contain Bacillus subtilis + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for bacitracin


an antibiotic used mainly in treating bacterial skin infections: obtained from the bacterium Bacillus subtilis
Word Origin
C20: baci(llus) + -trac- from Margaret Tracy (born 1936), American girl in whose blood Bacillus subtilis was found; see -in
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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bacitracin in Medicine

bacitracin bac·i·tra·cin (bās'ĭ-trā'sĭn)
A polypeptide antibiotic obtained from a strain of the bacterium Bacillus subtilis and used as a topical treatment for certain bacterial infections, especially those caused by cocci.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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