Webster's New World Medical Dictionary

tongue tie
A minor congenital anomaly in which
the flap of mucous membrane under the tongue
(known as the frenulum) is unusually short and
limits somewhat the mobility of the tongue. The
name tongue tie reflects the unfounded folk belief
that with this condition, a child cannot feed or
speak properly because the tongue is “tied.” The
medical term for this condition is ankyloglossia.
tonometry
A standard eye test that is done to
determine the fluid pressure inside the eye.
Increased pressure is a possible sign of glaucoma, a
common and potentially very serious problem if not
detected and treated promptly. The pressure inside
the eye is measured from the outside. In most cases,
the pressure can be measured without anything
actually touching the eye. The patient looks at an
instrument that blows a small puff of air into the eye
and then uses a special kind of sensor to detect the
amount of indentation that the air puff causes on the
surface of the eye. This indentation is normal and
lasts only a fraction of a second. If patients need to
have their eye pressure measured when this type of
machine is not available (as in an emergency
room), the pressure can be measured with an
instrument that resembles a pen. One end of the
instrument is placed on the surface of the eyeball.
This feels like having a contact lens put in the eye.
Tonometry does not cause significant pain and it is
risk free. 
tonsil
A small mass of lymphoid tissue in the
back of the throat (pharynx). There are usually two
tonsils, one on either side of the posterior pharynx.
Like other lymphatic tissue, the tonsils are part of
the immune system and should not be removed
without a sufficient reason.
tonsil stone
See 
tonsillolith.
tonsillectomy
The surgical removal of both
tonsils.