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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «T»:

  1. Triple C's Triple C's
    Triple C's: Street name for dextromethorphan (DXM)....
  2. Triplet Triplet
    Triplet: One of three, as: 1. One of three babies in a multiple birth. Or three animals gestated together. 2. In genetics, a set of three bases in DNA. Also called a codon. See: Crick-Brenner experiment. 3. In optics, a combination of three simple lenses cemented together. The word triplet came i...
  3. Triptan Triptan
    Triptan: A class of drugs introduced in the 1990s for the treatment of migraine that act as agonists for 5-hydroxytryptamine (5-HT) receptors. The triptans are often very effective in relieving migraine but do not prevent future attacks or lessen their frequency. Migraine is believed to be due to ...
  4. Triptans (Triptan) Triptans (Triptan)
    Triptan: A class of drugs introduced in the 1990s for the treatment of migraine that act as agonists for 5-hydroxytryptamine (5-HT) receptors. The triptans are often very effective in relieving migraine but do not prevent future attacks or lessen their frequency. Migraine is believed to be due to ...
  5. Triskaidekaphobia Triskaidekaphobia
    Triskaidekaphobia: Fear of the number 13. Written reference to this fear dates to the late 1800s. The term triskaidekaphobia appeared in the early 1900s. It is not easy to pronounce unless one speaks Greek. From treiskaideka, the Greek word for thirteen + phobia, fear of = a fear of thirteen....
  6. Trismus Trismus
    Trismus: Inability to open the mouth fully. This may be due to spasm of the jaw muscles and be a symptom of tetanus (lockjaw). Or it may be due to abnormally short jaw muscles, as in the trismus-pseudocamptodactyly syndrome....
  7. Trismus and pseudocamptodactyly syndrome Trismus and pseudocamptodactyly syndrome
    Trismus and pseudocamptodactyly syndrome: See: Hecht syndrome....
  8. Trismus-pseudocamptodactyly syndrome Trismus-pseudocamptodactyly syndrome
    Trismus-pseudocamptodactyly syndrome: See: Hecht syndrome....
  9. Trisomy Trisomy
    Trisomy: The presence of three copies of a chromosome rather than the normal two. The most common trisomies in newborns are trisomy 13 (Patau syndrome), trisomy 18 syndrome (Edwards syndrome) and trisomy 21 (Down syndrome). The most common trisomy among spontaneous abortions is trisomy 16. See also...
  10. Trisomy 13 syndrome Trisomy 13 syndrome
    Trisomy 13 syndrome: Condition with three rather than the normal two chromosomes #13. Children born with this syndrome have multiple malformations and mental retardation due to the extra chromosome #13. The congenital malformations (birth defects) commonly include scalp defects, hemangiomas (blood v...
  11. Trisomy 18 syndrome Trisomy 18 syndrome
    Trisomy 18 syndrome: There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low birth weight, small head (microcephaly), small jaw (micrognathia),...
  12. Trisomy 21 syndrome Trisomy 21 syndrome
    Trisomy 21 syndrome: A common chromosome disorder, often called Down syndrome, due to an extra chromosome number 21 (trisomy 21). The chromosome abnormality affects both the physical and intellectual development of the individual. Trisome 21 (Down) syndrome is associated with a major risk for...
  13. Tritiated Tritiated
    Tritiated: Containing atoms of tritium (hydrogen-3) in the place of hydrogen (H) in a molecule. See also: Tritiated thymidine....
  14. Tritium Tritium
    Tritium: Hydrogen-3, an isotope of hydrogen. Tritium is a long-lived weak emitter of radiation and can be easily incorporated in large molecules such as DNA, and is therefore much used for autoradiography in the laboratory....
  15. tRNA tRNA
    tRNA: Transfer RNA....