/gramz/ , ( 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 .
[ named after Hans C. J. Gram (1853-1938), Danish bacteriologist ]