Pronunciation: (gramz), [key] (sometimes l.c.)
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. Cf. Gram-negative, Gram-positive.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.