Definition of toluidine blue in English:

toluidine blue

Syllabification: to·lu·i·dine blue
Pronunciation: /təˌlo͞oəˌdēn ˈblo͞o


  • A synthetic blue dye used chiefly as a stain in biology.
    • A thiazine dye; chemical formula: C15H16ClN3S
    More example sentences
    • Specimens were stained with toluidine blue and basic fuchsin.
    • The matrix or ground substance of cartilage is strongly basophilic and stains metachromatically with toluidine blue and other similar basic dyes.
    • Inactive DNA is readily stained with hematoxylin, toluidine blue, and other similar basic dyes.


late 19th century: toluidine from toluene + -ide + -ine4.

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Pronunciation: skōSH
a small amount; a little