What does hematoxylin mean?
Hematoxylin is a dark blue to purple dye obtained from the heartwood of logwood trees and used chiefly in histology to stain cell nuclei, making them stand out clearly against contrasting tissue colors. In laboratory preparations, it is often combined with eosin in the standard H&E stain, though the compound is also used in other staining methods. Chemically, hematoxylin is a yellowish crystalline substance; oxidation produces hematein, the strongly colored form chiefly responsible for the stain. This distinction explains why dictionaries may describe hematoxylin both as a chemical and as a dye. The word belongs chiefly to formal scientific and medical vocabulary, and haematoxylin is the usual British spelling. Its name combines Greek words for “blood” and “wood,” a memorable clue to its history and logwood source. Although it sounds obscure, the dye is foundational to routine microscopic examination, where nuclear detail helps reveal cell structure and tissue organization.
nounA blue or blue-purple dye obtained from logwood and used chiefly in histology to stain cell nuclei. Chemically, it is a yellowish crystalline compound that can be oxidized to form hematein, the strongly colored substance responsible for much of its staining action.
- The wood-derived dye used in microscopy, especially for staining cell nuclei blue or purple.
- The yellowish crystalline compound obtained from logwood that can be oxidized to form hematein.
"The technician stained the tissue section with hematoxylin and eosin to make the cellular structures easier to distinguish."
"The pathology report noted that the nuclei had been stained with hematoxylin."
"Hematoxylin derived from logwood became an important tool for examining cells under a microscope."
Hematoxylin is normally treated as an uncountable mass noun, although plural forms occasionally occur when referring to distinct preparations or samples.
"A small amount of hematoxylin was added to the staining solution."
The blue stain that reveals cell nuclei hides a surprising clue in its name: “bloodwood.”
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hematoxylin come from?
The name combines the Greek haîma, meaning “blood,” and xýlon, meaning “wood,” literally giving “bloodwood.” It entered English as a 19th-century scientific term for a substance extracted from logwood. Related forms such as hematoma and hematology preserve the same Greek blood-root.
How hematoxylin is actually used
This is a formal scientific and medical term, normally treated as an uncountable mass noun. Haematoxylin is the usual spelling in British English.
Easily confused with hematoxylin
Hematein is the oxidized, strongly colored form of hematoxylin, whereas hematoxylin is the parent compound obtained from logwood.