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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.
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Origin of R factor

1960–65; r(esistance) factor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

r factor in Medicine

R factor

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