Gram-negative

Gram-negative

[gram-neg-uh-tiv]
adjective (often lowercase)
(of bacteria) not retaining the violet dye when stained by Gram's method.

Origin:
1905–10; see Gram's method

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Collins
World English Dictionary
Gram-negative
 
adj
designating bacteria that fail to retain the violet stain in Gram's method

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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