Dictionary

triple X See XXX syndrome.

triploid Having three full sets of chromosomes: 3 copies of each autosomal chromosome plus 3 sex chromosomes. In humans, triploid is equal to 69 chromosomes.

triplo-X See XXX syndrome.

trismus pseudocamptodactyly syndrome See Hecht 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).

trisomy 13 syndrome The presence of three copies of chromosome 13, rather than the normal two. Children with trisomy 13 syndrome are profoundly mentally retarded and have multiple malformations, commonly including scalp defects, hemangiomas (blood vessel malformations) of the face and nape of the neck, cleft lip and palate, malformations of the heart and abdominal…

transvestite A person who dresses in the clothing of the opposite sex. Also known as a crossdresser.

transvestitism Dressing in the clothing of the opposite sex. Transvestitism is distinct from both transsexualism and homosexuality. Also known as cross-dressing.

trauma A physical or emotional injury.

trauma center A specialized hospital facility that is designed to provide diagnostic and therapeutic services for patients with injuries.

traumatic alopecia See alopecia, traumatic.

traumatology The branch of surgery that deals with injured patients, usually on an emergency basis. Patients who have suffered significant physical trauma, as from a car accident, may be cared for in a traumatology unit.