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stain British & World English

Mark or discolour with something that is not easily removed

stain English Thesaurus

her clothing was stained with blood

Gram stain British & World English

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

wood stain British & World English

A commercially produced substance for colouring wood

Gram stain New Oxford Dictionary for Writers & Editors

technique for distinguishing between two categories of bacteria (Gram-positive and Gram-negative)

port wine stain British & World English

A kind of large, deep red birthmark, a persistent haemangioma or naevus, typically on the face

bloodstain British & World English

A mark or discoloration on fabric or a surface caused by blood