Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
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Testosterone
Testosterone: A "male hormone" -- a sex hormone
produced by the testes that encourages the development of male sexual
characteristics, stimulates the activity of the male secondary sex
characteristics, and prevents changes in them following castration.
Chemically, testosterone is 17-beta-hydroxy...
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Testosterone replacement therapy
Testosterone replacement therapy: The practice
of giving testosterone to treat conditions in which the
testes do not produce enough testosterone. This may be due to
absence, injury, or disease.
Testosterone is available in oral, IV, and
patch forms. As with estrogen replacement therapy for
wom...
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Tetanus
Tetanus:
An often fatal infectious disease caused by the bacteria Clostridium tetani (C. tetani) which usually enters the body through a puncture, cut, or open wound. Tetanus is characterized by profoundly painful spasms of muscles, including "locking" of the jaw so that the mouth cannot open (lockj...
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Tetany
Tetany: A combination of signs and symptoms, due usually to low calcium, that can include:
Hyperreflexia (overactive neurological reflexes), Carpopedal spasm (spasms of the hands and feet),
Cramps, and
Laryngospasm (spasm of the larynx, the voice box).
Tetany characteristically is considered to ...
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Tetracycline
Tetracycline: A family of broad-spectrum antibiotics effective against a remarkably wide variety of organisms. Bacteria susceptible to teracycline include H. flu (Hemophilus influenzae), strep (Streptococcus pneumoniae), Mycoplasma pneumoniae, Chlamydia psittaci, Chlamydia trachomatis, and Neisseria...
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Tetraethyl lead
Tetraethyl lead: An
anti-knock compound added to motor fuel. Also known as tetraethylplumbane,
tetraethyl lead has highly adverse effects on human health. It causes lead poisoning.
The History of Tetraethyl Lead
In 1921 three General Motors (GM) engineers -- Charles
Kettering, Thomas Midgeley, a...
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Tetraethylplumbane
Tetraethylplumbane: Tetraethyl lead....
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Tetrafluoroethylene
Tetrafluoroethylene: A substance that is a possible carcinogen (cancer-causing agent) used in the production of polymers such as polytetrafluoroethylene.
The US government in 2000 classified tetrafluoroethylene as "reasonably anticipated to be a human carcinogen." In laboratory animal studies of te...
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Tetrahydrogestrinone
Tetrahydrogestrinone: A "designer steroid" with anabolic properties. Known as THG....
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Tetralogy of Fallot
Tetralogy of Fallot: A combination of four heart defects that are present together at birth, accounting for about 10% of all congenital heart disease.
The four defects that constitute the tetralogy of Fallot are:
Ventricular septal defect (VSD) -- A hole between the two bottom chambers, the ventri...
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Tetranucleotide
Tetranucleotide: A sequence of 4 base pairs. (Bases are the building blocks of DNA.) Expansion of a tetranucleotide repeat (CCTG) in the ZNF9 gene causes type 2 myotonic dystrophy....
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Tetrapeptide
Tetrapeptide: A peptide consisting of four amino acids....
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Tetraphocomelia-thrombocytopenia syndrome
Tetraphocomelia-thrombocytopenia syndrome:
See TAR syndrome....
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TGA
TGA: 1. Transient global amnesia.
2. Transposition of the great arteries....
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TGF
TGF: Transforming growth factor....
