A type of white blood cell. Basophils are granulocytes.
 
Biology Dictionary
Definition:
A granulocyte that has a two-lobed nucleus and is easily stained by basic dyes.
A type of white blood cell which can be easily stained with alkaline (basic) dyes. It has a nucleus with two lobes and it carries around substances like histamine and a hormone called serotonin.
Any structure, cell, or other bodily object which stains easily with alkaline dyes.