Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A staining technique used to classify bacteria in which a bacterial specimen is first stained with crystal violet, then treated with an iodine solution, decolorized with alcohol, and counterstained with safranin. Because of differences in cell wall structure, gram-positive bacteria retain the violet stain whereas gram-negative bacteria do not.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram's solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the gentian violet are Gram-positive and those that do not retain it are Gram-negative

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After Hans Christian Joachim Gram, (1853–1938), Danish physician.]

Examples

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