Gram-negative
(of bacteria) not retaining the violet dye when stained by Gram's method.
Origin of Gram-negative
1Words Nearby Gram-negative
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use Gram-negative in a sentence
The organism is a short, thick diplobacillus, is frequently intracellular, and is Gram-negative (Fig. 126).
A Manual of Clinical Diagnosis | James Campbell ToddAnd here it says, "Gram negative, diplococci intra- and extra-cellular morphological resembling neisseria gonococci."
Warren Commission (8 of 26): Hearings Vol. VIII (of 15) | The President's Commission on the Assassination of President KennedyYoung individuals are stained by Gram's method; older individuals are, however, Gram negative.
The Bacillus of Long Life | Loudon DouglasThe bacillar threads are in places Gram-negative, in others Gram-positive, and bear small club-like swellings (see Fig. 14).
The Bacillus of Long Life | Loudon DouglasThe Gram-positive bacteria are violet and the Gram-negative are red.
The Fundamentals of Bacteriology | Charles Bradfield Morrey
British Dictionary definitions for Gram-negative
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
Scientific definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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