White blood corpuscles, colourless, without haemoglobin that help to combat infection.

All the white cells of the blood and their precursors (myeloid cell series, lymphoid cell series) but commonly used to indicate granulocytes exclusive of lymphocytes.

White blood cells responsible for fighting disease.

A white blood cell which contains a nucleus but has no haemoglobin.

White blood cells, normally 5000-9000/mm3; includes polymorphonuclear neutrophils, lymphocytes, monocytes, polymorphonuclear eosinophils, and polymorphonuclear basophils. A ‘white cell count’ determines the total; a ‘differential cell count’ estimates the numbers of each type. Fever, haemorrhage, and violent exercise cause an increase (leucocytosis); starvation and debilitating conditions a decrease (leucopenia).

White blood cells. They are colourless, and have a well-formed nucleus. Healthy people have around 8,000 leucocytes per cubic millimetre of blood. There are three main classes: granulocytes, lymphocytes and monocytes.

An alternate way to spell “leukocyte,” which refers to a specific type of blood cell.