Noun gram stain has 1 sense
  1. Gram's method, Gram method, Gram's procedure, Gram's stain, Gram 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
    --1 is a kind of staining
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