basophil

(-fīl', -fĭl)
n.
A cell, especially a white blood cell, having granules that stain readily with basic dyes.

(bā'sə-fĭl, -zə-) or ba·so·phile (-fīl')
n.

A cell, especially a white blood cell, having granules that stain readily with basic dyes.

1. any structure, cell or histological element staining readily with basic dyes.
2. a granular leukocyte with an irregularly shaped, relatively pale-staining nucleus that is partially constricted into two lobes, and with cytoplasm containing coarse bluish-black granules of variable size.
3. a beta cell of the adenohypophysis.
4. basophilic.

• b. cell — a beta cell of the adenohypophysis which produces luteinizing and follicle stimulating hormones.
• b. degranulation test — an in vitro cellular test for immediate hypersensitivity; it detects degranulation of basophils, by their loss of affinity for staining, when blood from a hypersensitive dog is incubated with allergen extracts.

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The noun has one meaning:

Meaning #1: a leukocyte with basophilic granules easily stained by basic stains
  Synonym: basophile

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