gram method

Noun

• 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

Related words

• Synonyms: 
  Gram's method , Gram method , Gram's procedure , Gram's stain , Gram stain