Webster's New World Medical Dictionary

white blood cell
See 
CBC; leukocyte.
white blood cell count
The number of white
blood cells (WBCs) in the blood. The normal range
for the WBC count varies among laboratories but is
usually between 4,300 and 10,800 cells per cubic
millimeter. It can be expressed in international units
as (4.3–10.8)
×
10
9
cells per liter. A low WBC count
is called leukopenia. A high WBC count is termed
leukocytosis. Also known as leukocyte count.
white coat hypertension
A transient increase in
blood pressure (hypertension) that is triggered by
the sight of medical personnel in white coats (or
other attire). Ideally, people so affected should do
their best to relax when in the medical office.
white matter
The part of the brain that contains
myelinated nerve fibers. The white matter is white
because it is the color of myelin, the insulation that
covers nerve fibers.
white spots on the nails
See 
jogger’s nails.
white subungual onychomycosis, proximal
See 
onychomycosis, proximal white subungual.
Werner-His disease
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whitehead
A familiar term for what is medically
called a closed comedo. A comedo, the primary sign
of acne, consists of a dilated (widened) hair follicle
filled with keratin squamae (skin debris), bacteria,
and sebum (oil). A whitehead is a comedo that has
an obstructed opening to the skin. A closed comedo
may rupture and cause a low-grade skin inflamma-
tory reaction in the area.
WHO
World Health Organization.
whooping cough
See 
pertussis.