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  1. Oxford Dictionary

    Gram stain

    • IPA[ɡram]

    英式

    • n.
      a staining technique for the preliminary identification of bacteria, in which a violet dye is applied, followed by a decolorizing agent and then a red dye. The cell walls of certain bacteria (denoted Gram-positive) retain the first dye and appear violet, while those that lose it (denoted Gram-negative) appear red.

    • noun: Gram stain