单词	counterstain
释义	counterstain verb coun·​ter·​stain ˈkau̇n-tər-ˌstān  counterstained; counterstaining; counterstains transitive verb : to stain (something, such as a microscopy specimen) so as to color parts (such as the cytoplasm of cells) not colored by another stain (such as a nuclear stain) counterstain noun Word History First Known Use 1895, in the meaning defined above Medical Definition counterstain 1 of 2 noun coun·​ter·​stain -ˌstān  : a stain used to color parts of a microscopy specimen not affected by another stain especially : a cytoplasmic stain used to contrast with or enhance a nuclear stain counterstain 2 of 2 transitive verb : to stain (a tissue or microscopy specimen) with an additional usually contrasting color
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