Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
t.i.d. (on prescription)
t.i.d. (on prescription): Seen on a prescription, t.i.d. means
three times a day. It is an
abbreviation for "ter in die" which in Latin means three
times a day. The
abbreviation t.i.d. is sometimes written without a period
lower-case letters as "tid" or in capital letters as
T1-T12 (thoracic vertebrae)
T1-T12 (thoracic vertebrae): The symbols T1 through T12 represent the 12 thoracic vertebrae. The thoracic vertebrae are situated between the cervical (neck) vertebrae and the lumbar vertebrae.
The thoracic vertebrae provide attachment for the ribs and make up part of the back of the thorax (the ches...
T4: Thyroxine, a thyroid hormone. The number 4
is sometimes in subscript....
Tabes dorsalis: Slowly progressive degeneration of the spinal cord that occurs in the tertiary (third) phase of syphilis a decade or more after originally contracting the infection. Among the terrible features of tabes dorsalis are lancinating lightning-like pain, ataxia (wobbliness), deterioration ...
Table: In anatomy, one of the two layers of compact bone that make up the interior and exterior walls of the cranium. They are the plates of the skull and are separated from each other by the diploe which is a soft spongy material containing bone marrow....
An old-fashioned but convenient household measure of capacity. A
tablespoon holds about 3 teaspoons, each containing about 5 cc, so
a tablespoon = about 15 cc of fluid....
Tablet: In pharmacy, a medication, usually mixed with a binder powder, molded and pressed into the form of a tablet, traditionally circular or disk-shaped, but more recently also oblong or differently shaped. From the French tablette, little table....
Tablet splitter: A device for tablet splitting....
Tablet splitting: The practice of cutting tablets in half. The reason is usually financial. To reduce costs, a physician may prescribe pills that have twice the dose a patient needs and then ask the patient to split the pills in half. To make sure the patient takes the correct dose, patients are giv...
Tabun: A man-made chemical warfare agent classified as a nerve agent. Nerve agents are the most toxic and rapidly acting of the known chemical warfare agents. They are similar to pesticides (insect killers) called organophosphates in terms of how they work and what kinds of harmful effects they caus...
TACE: Transarterial chemoembolization, a procedure in which the blood supply to a tumor is blocked (embolized) and chemotherapy is administered directly into the tumor. Used to treat liver cancer....
Tache noire: Black spot (in French), a small ulcer
covered with a black crust at the site of a tick bite, characteristic of several
tick-borne rickettsial diseases. ...
Tachycardia: A rapid heart rate, usually defined as
greater than 100 beats per minute. The tachycardias include
paroxysmal atrial tachycardia
(PAT), and ventricular tachycardia.
Sinus tachycardia is due to rapid firing of a normal structure called the sinoatrial (sinus) node w...
Tachycardia, paroxysmal atrial
Tachycardia, paroxysmal atrial: See: Paroxysmal atrial tachycardia ....
Tachycardia, sinus: A fast heartbeat (tachycardia) because
of rapid firing of the sinoatrial (sinus) node.
The sinoatrial (or sinus) node is the natural pacemaker of the
heart. It is located in the wall of the right atrium (the right upper
chamber of the heart). Normal cardiac impulses start ther...