gram stain

Noun gram stain has 1 sense

• gram stain(n = noun.act) gram method, gram's method, gram's procedure, gram's stain - 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;
is a kind of staining