Webster's New World Medical Dictionary

polio immunization
One of the two polio vac-
cines that are available: oral polio vaccine (OPV)
and inactivated polio vaccine (IPV). OPV was for-
merly recommended for children in the US but was
shown to actually cause polio in extremely rare
cases and is no longer recommended. IPV is given
as a shot in the arm or leg.
polio vaccine, inactivated
A vaccine that is
made from a suspension of poliovirus types that are
inactivated (killed) with formalin. Abbreviated IPV.
IPV is given by injection. 
polio vaccine, killed
See 
polio vaccine,
inactivated.
polio vaccine, live
See 
polio vaccine, oral.
polio vaccine, oral
A vaccine that contains live
attenuated (weakened) poliovirus. Abbreviated
OPV. 
polio vaccine, Sabin
See 
polio vaccine, oral.
polio vaccine, Salk
See 
polio vaccine, inacti-
vated.
poliomyelitis
See 
polio.
pollen
Small, light, dry protein particles from
trees, grasses, flowers, and weeds that may be
spread by the wind. Pollen particles are usually the
male sex cells of a plant, and they are smaller than
the tip of a pin. Pollen is a potent stimulator of aller-
gic responses. It lodges in the mucous membranes
poison ivy
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that line the nose and in other parts of the respira-
tory tract, causing irritation and histamine reactions.
pollex
The thumb.
poly
A short form for polymorphonuclear leuko-
cyte, a type of white blood cell.