hematoxylin
noun
he·ma·tox·y·lin ˌhē-mə-ˈtäk-sə-lən 
: a crystalline phenolic compound C16H14O6 found in logwood and used chiefly in biological staining
Word History
Etymology
International Scientific Vocabulary, from New Latin Haematoxylon, plant genus
First Known Use
circa 1847, in the meaning defined above
Medical Definition
hematoxylin
noun
he·ma·tox·y·lin
variants or chiefly British haematoxylin
ˌhē-mə-ˈtäk-sə-lən
: a crystalline phenolic compound C16H14O6 found in logwood and used chiefly as a biological stain because of its ready oxidation to hematein