What does basophile mean?
A basophile (more commonly spelled "basophil") is one of the least numerous types of white blood cell, making up well under one percent of the leukocytes circulating in human blood. It belongs to the granulocyte family and is distinguished by large granules that stain darkly with basic dyes such as haematoxylin — hence the name, which derives from Greek roots meaning "base-loving." Basophiles play a role in inflammatory responses, particularly allergic reactions, by releasing histamine and other mediators. The term can also apply more broadly to any cell that stains readily with basic dyes, a usage found in histology. Because of its rarity, the word appears almost exclusively in medical, biological, and laboratory contexts rather than everyday conversation, and readers encountering it will most often find it in discussions of blood tests, allergy, or microscopy.
nounA type of white blood cell (granulocyte) whose granules stain readily with basic dyes; also spelled "basophil". More broadly, any cell or tissue element that stains readily with basic dyes.
- A granular white blood cell whose cytoplasmic granules stain with basic dyes, involved in inflammatory and allergic responses.
- Any cell or cellular component that stains readily with basic dyes.
"The blood smear revealed an elevated count of basophiles, prompting the hematologist to investigate further."
"Although basophiles make up less than one percent of circulating white blood cells, they play an outsized role in allergic reactions."
"Under high magnification, the pathologist identified the basophiles by their coarse, darkly staining granules."
The standard plural adds -es; the variant spelling "basophils" is more common in modern medical writing.
"Basophiles release histamine during allergic reactions."
Its name literally means 'base-loving' — this tiny blood cell was named for how eagerly it soaks up basic dye under the microscope.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of basophile
The word combines the Greek root "basis" (a base or foundation) with the suffix "-phile" from Greek "philein" (to love), reflecting the cell's affinity for basic stains used in laboratory staining techniques. It entered English in the late nineteenth century alongside the development of modern histological staining methods. Cognates sharing the "basis" root include "basic", "basal", and "basement".
Related word forms
How basophile is actually used
"Basophile" is chiefly a variant spelling of "basophil", which is more common in modern medical literature; both spellings are acceptable in British and American usage. The word belongs to formal scientific and medical registers.
Easily confused with basophile
An eosinophil is a different granulocyte whose granules stain with acidic dyes rather than basic dyes.
A neutrophil is the most abundant white blood cell and its granules are neutral, staining with neither strongly basic nor acidic dyes.