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Glossary Words 1 - 20 of 93
T lymphocytes (T cells)
Specialized lymphocytes that mature within the thymus; two important types are Cytotoxic T cells and helper T cells.
tachycardia
Abnormally fast heart rate.
tachypnea
Abnormally rapid breathing.
tachyzoites
Actively dividing form of the parasite Toxoplasma gondii found in the tissues of an infected animal.
tail-chewing
A stable vice exhibited primarily by yearlings and two-year-olds.
tapadero
A leather cuplike device over the front of some western stirrups, to protect the rider’s feet against thorns and other sharp objects.
tapetum
The reflective layer in the upper half of the back of the eye.
tarpan
A prehistoric wild horse type that ranged from today’s Southern France and Spain eastward to central Russia. The original wild tarpan died out during the nineteenth century when the horses’ natural forest and steppe habitat was destroyed by human civilization. The modern tarpan is a genetic recreation of the original wild breed based on genetic material from several European pony breeds that are believed to had descended from the prehistoric tarpan.
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taxonomy
The classification of organisms into different categories on the basis of their individual physical and biochemical relationships to each other.
telogen
The phase of hair follicle activity during which the follicle is resting and not producing new hair.
tempo
(Italian for “time”)
1. The frequency-speed of footfalls at a gait.
2. In dressage, the number of strides between the lead changes in gallop. Two-tempi changes means changing the lead after every two strides.
temporal region
Area of the head in front of the ears and lateral to the forehead.
tendinitis
Inflammation of a tendon or tendon muscle attachment; also spelled tendonitis.
tendon
Fibrous tissue that attaches muscle to bone.
tenosynovitis
Inflammation of the lining membrane that surrounds the tendon sheath.
tenotomy
Surgical cutting of a tendon.
teratogen
Any compound or agent that disrupts normal development in utero, producing defects in the developing embryo.
teratology
The study of abnormal development and congenital malformations.
teratoma
Ovarian tumor characterized by the formation of cysts as well as a bizarre combination of different embryonic tissues such as bone, cartilage, teeth, and hair.
terret
On a harness, a loop or ring on the saddle through which the reins pass.
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