neutrophil

neutrofiili puhekieltä Of a cell: being more easily or more fully stained by neutral dyes than by acidic or alkaline (basic) ones.
puhekieltä Such a cell, especially a white blood cell.
2011, Terence Allen and Graham Cowling, The Cell: A Very Short Introduction, Oxford 2011, p. 89:

One litre of human blood contains about five billion neutrophils (around half of all white blood cells).