Triplet
Crick-Brenner experiment. 3. In optics, a combination of three simple lenses cemented together.
The word triplet came into use in the mid-17th century. It was formed from triple, just as doublet was formed from double.
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- 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 dilatation of cranial blood vessels and the release […]
- 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 dilatation of cranial blood vessels and the release […]
- 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.
- 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.
- 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 (Edwards syndrome), and trisomy 21 (Down syndrome).