Webster's New World Medical Dictionary

fungal nail infection
See 
onychomycosis.
fungiform
Mushroom-shaped.
fungiform papillae
Broad, flat structures that
house taste buds in the central portion of the dor-
sum (back) of the tongue. Fungiform papillae were
once thought to resemble little mushrooms.
fungus
A plantlike organism that does not contain
chlorophyll and feeds on organic matter. An exam-
ple of a common fungus is the yeast organism that
causes thrush and diaper rash (diaper dermatitis).
fungus, foot
See 
athlete’s foot.
funnel chest
“Caved-in” chest. Usually an unim-
portant isolated finding first evident at birth, funnel
chest can occasionally be part of a connective-tissue
disorder such as Marfan syndrome. Also known as
pectus excavatum.
funny bone
A sensation, rather than an actual
bone, that one gets when the elbow is bumped and
the ulnar nerve that runs past the elbow is stimulated
and produces a strange, almost painful, sensation.
FUO
See 
fever of unknown origin.
furosemide
A common diuretic medication
(brand name: Lasix) that is prescribed to rid the
body of excess fluid. Furosemide may be recom-
mended to treat fluid accumulation as a result of
kidney disease, fluid in the lungs, congestive heart
failure, high blood pressure, and other conditions.
See also 
diuretic, loop.
furuncle
See 
boil.
fusiform
Formed like a spindle: wider in the
middle and tapering toward the ends. For example,
a fusiform aneurysm is a vascular outpouching that
is shaped like a spindle.
fusiform aneurysm
An outpouching or widening
of an artery or a vein that is shaped like a spindle.
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