gram-negative








adjective (often lowercase)

  1. (of bacteria) not retaining the violet dye when stained by Gram’s method.

adjective

  1. designating bacteria that fail to retain the violet stain in Gram’s method

adj.

  1. Of, relating to, or being a bacterium that does not retain the violet stain used in Gram’s method.

  1. 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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