Gram's method

[ gramz ]
/ græmz /

noun (sometimes lowercase)

a method of staining and distinguishing bacteria, in which a fixed bacterial smear is stained with crystal violet, treated with Gram's solution, decolorized with alcohol, counterstained with safranine, and washed with water.

Origin of Gram's method

named after Hans C. J. Gram (1853–1938), Danish bacteriologist Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for gram's method

Gram's method


bacteriol a staining technique used to classify bacteria, based on their ability to retain or lose a violet colour, produced by crystal violet and iodine, after treatment with a decolorizing agentSee also Gram-negative, Gram-positive

Word Origin for Gram's method

C19: named after Hans Christian Joachim Gram (1853–1938), Danish physician
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