Webster's New World Medical Dictionary

foramina of Luschka
A pair of openings from
the fourth ventricle of the brain to the central canal
of the upper end of the spinal cord.
forceps
An instrument that has two blades and
a handle and is used for handling, grasping, or
compressing.
forceps, obstetrical
A forceps designed as an
aid in the vaginal delivery of a baby. Forceps may be
used to ease delivery or to cope with problems of
fetal distress or fetal position. The decision to use
forceps must be made by an obstetrician.
forearm
The portion of the upper limb from the
elbow to the wrist. The forearm has two bones: the
radius and ulna.
foreign body airway obstruction
Partial or
complete blockage of the breathing tubes to the
lungs due to the presence of a foreign body, such
as food or another object. See also 
airway
obstruction.
forensic medicine
The branch of medicine
dealing with the application of medical knowledge
to establish facts in civil or criminal legal cases,
such as an investigation into the cause and time of a
suspicious death. Also known as forensic pathology.
foreskin
The fold of skin that covers the head
(glans) of the penis. The inside of the foreskin has
preputial glands, a special type of sebaceous (oil)
glands that secrete an oily lubricant known as
smegma. The foreskin is often surgically removed
via circumcision. Also known as prepuce. See also
circumcision, male.
foreskin, inflammation of the
See 
posthitis.
foreskin, tight
See 
phimosis.
foreskin and glans, inflammation of the
See
balanoposthitis.
Forestier disease
See 
diffuse idiopathic skele-
tal hyperostosis.
formula
A prepared substitute for breast milk.
Formula does not contain the special immunity fac-
tors found in breast milk that help the baby to fight
off infections, and it may not include all the vita-
mins, minerals, and enzymes found in human breast
milk. For that reason, experts in infant nutrition
agree that breast milk is the best source of nutrition
for infants.
formula feeding
Feeding an infant or toddler
prepared formula instead of or in addition to
breastfeeding. Formula feeding is indicated when
the mother has an illness that could be passed on to
the baby through breast milk or through the close
physical proximity required for breastfeeding.
Otherwise, experts in infant nutrition agree that
breastfeeding is best.