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R factor

noun
1.
a genetic component of some bacteria that provides resistance to antibiotics and can be transferred from one bacterium to another by conjugation.
Origin
1960-1965
1960-65; r(esistance) factor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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r-factor in Medicine

R factor n.
See resistance plasmid.

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