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Progressive loss of function of a tissue or organ.

A host infected with a parasite normally found in another host species.

The position of a horse that is holding his head above the rider’s hands, done to evade the effects of the bit. See also “on the bit”, “behind the bit”.
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A walled-off lesion filled with pus.

General term for a mite infestation.

Ability of the lens to change its shape in order to focus vision effectively on objects at different distances from the eye.

Acepromazine also known as Ace is a very useful tranquilizer that depresses the central nervous system, causing sedation, relaxation, and a reduction in involuntary movements. It does not provide any relief from pain, however, and will not prevent a horse from moving or kicking (possibly slower) if it is startled or feels pain.
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The "cup" or "socket" portion of the hip joint.

Messenger molecule released from axon terminals by a nerve impulse; responsible for transmission of the nerve impulse across the synaptic cleft to the muscle fiber supplied by the nerve.

Enzyme capable of breaking down acetylcholine.

In racing, stirrups adjusted so the inside one is lower than the outside one.

Systemic condition characterized by abnormally acid blood.

In racing, one wager to win, place, and show (in effect, three bets in one). If the chosen horse finishes first, the ticket holder receives the win, place, and show payoffs. If the horse finishes second, payoff is for place and show; if third, for just show.

A vital protein component of muscle, one of the proteins responsible for muscle contraction.

Single or multiple, firm, elevated, plaque or papulelike skin lesions that result from excessive exposure to sunlight; considered to be precancerous lesions.

Pus-producing diseases caused by bacteria of the genus Actinomyces.

Action - describes the style (form) that the legs exhibit during the time period when they are moving above the ground/in the air in reference to the height (elevation) and roominess of the gait. The action depends on the structure of the legs, on the relative length ratio of the bones and the carrying time period of the hind leg. Various breeds and kinds of horses have their own special/certain action – high, low, flat etc. (carriage horse has a high action as against the racehorse has low and flat action.
The animatedly high action of a Saddlebred or Tennessee Walking Horse contributes to the breed’s showiness, while the low, daisy cutter action of a show hunters trot is valued for its ability to cover ground at each stride.
low action high action

Vaccination.

Of short duration and relatively severe; having a rapid onset.

To increase by one the number of strides between two jumps, done by the riders shortening the horse’s stride. See leave out a stride.