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Gram-negative

[gram-neg-uh-tiv] /ˈgræmˈnɛg ə tɪv/
adjective, (often lowercase)
1.
(of bacteria) not retaining the violet dye when stained by Gram's method.
Origin
1905-1910
1905-10; see Gram's method
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Gram-negative

Gram-negative

adjective
1.
designating bacteria that fail to retain the violet stain in Gram's method
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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Gram-negative in Medicine

gram-negative or Gram-negative
adj.
Of, relating to, or being a bacterium that does not retain the violet stain used in Gram's method.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Gram-negative in Science
gram-negative  
Relating to a group of bacteria that do not change color when subjected to the laboratory staining method known as Gram's method or Gram's stain. Gram-negative bacteria have relatively thin cell walls and are generally resistant to the effects of antibiotics or the actions of the body's immune cells. Gram-negative bacteria include E. coli and the bacteria that cause gonorrhea, typhoid fever, rickettsial fever, cholera, syphilis, plague, and Lyme disease. Compare gram-positive.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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