GRAM-NEGATIVE

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 Dictionary entry overview: What does Gram-negative mean? 

• GRAM-NEGATIVE (adjective)
  The adjective GRAM-NEGATIVE has 1 sense:

1. (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method

  Familiarity information: GRAM-NEGATIVE used as an adjective is very rare.

 Dictionary entry details 

• GRAM-NEGATIVE (adjective)

Sense 1

Meaning:

(of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method

Similar:

disconfirming; negative (not indicating the presence of microorganisms or disease or a specific condition)

Domain category:

bacteria; bacterium ((microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants)

 Context examples 

A species of bacteria within the phylum Proteobacteria consisting of gram-negative aerobic coccobacillus that are the causative agent of pertussis.

(Bordetella pertussis, NCI Thesaurus)

The abscesses contained Gram-negative bacteria, and when similar bacterial infections were deliberately induced in the CCM model animals, about half of them developed significant CCMs.

(Researchers connect brain blood vessel lesions to intestinal bacteria, NIH)

A genus of aerobic, Gram-negative, rod shaped bacteria assigned to the phylum Proteobacteria and the family Caulobacteraceae.

(Brevundimonas, NCI Thesaurus)

A genus of nonmotile facultatively anaerobic bacteria that lack a true cell wall, are gram-negative, and require sterol for growth.

(Mycoplasma, NCI Thesaurus)

A species of aerobic, Gram-negative, coccobacilli shaped bacteria assigned to the phylum Proteobacteria.

(Bordetella bronchiseptica, NCI Thesaurus)

A genus of aerobic, Gram-negative, coccobacilli shaped bacterium assigned to the phylum Proteobacteria and the family Alcaligenaceae.

(Bordetella, NCI Thesaurus)

A species of aerobic, Gram-negative, rod shaped bacteria assigned to the phylum Bacteroidetes.

(Bergeyella zoohelcum, NCI Thesaurus)

A genus of anaerobic, Gram-negative, rod shaped bacterium assigned to the phylum Proteobacteria and the family Desulfovibrionaceae.

(Bilophila, NCI Thesaurus)

A species of anaerobic, Gram-negative, rod shaped bacteria assigned to the phylum Proteobacteria.

(Bilophila wadsworthia, NCI Thesaurus)

A genus of aerobic, Gram-negative, rod shaped bacteria in the phylum Bacteroidetes and the family Flavobacteriaceae.

(Myroides, NCI Thesaurus)