Gram-positive

[gram-poz-i-tiv]
adjective (often lowercase)
(of bacteria) 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-positive
 
adj
designating bacteria that retain the violet stain in Gram's method

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

gram-positive or Gram-positive (grām'pŏz'ĭ-tĭv)
adj.
Of, relating to, or being a bacterium that retains 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-positive  
Relating to a group of bacteria that turn a dark-blue color when subjected to a laboratory staining method known as Gram's method. Gram-positive bacteria have relatively thick cell walls and are generally sensitive to the destructive effects of antibiotics or the actions of the body's immune cells. Gram-positive bacteria include beneficial nitrogen-fixing bacteria in soil, as well as the bacteria that cause anthrax, botulism, leprosy, tuberculosis, scarlet fever, and strep throat. Compare gram-negative.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for grampositive
This has a lethal effect on bacteria, especially on grampositive ones.
They are also active against a wide range of other grampositive bacteria.
Spectrum while retaining some activity against grampositive cocci.
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