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Gram-negative
[ gram-neg-uh-tiv ]
adjective
, (often lowercase)
- (of bacteria) not retaining the violet dye when stained by Gram's method.
Gram-negative
adjective
- designating bacteria that fail to retain the violet stain in Gram's method
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
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Word History and Origins
Origin of Gram-negative1
First recorded in 1905–10; Gram's method
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Example Sentences
The organism is a short, thick diplobacillus, is frequently intracellular, and is Gram-negative (Fig. 126).
From Project Gutenberg
And here it says, "Gram negative, diplococci intra- and extra-cellular morphological resembling neisseria gonococci."
From Project Gutenberg
Young individuals are stained by Gram's method; older individuals are, however, Gram negative.
From Project Gutenberg
The bacillar threads are in places Gram-negative, in others Gram-positive, and bear small club-like swellings (see Fig. 14).
From Project Gutenberg
The Gram-positive bacteria are violet and the Gram-negative are red.
From Project Gutenberg
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