Earth:  In hunting, a hole of any kind where the fox can hide.

Entire:  Either an adjective describing a stallion, or another noun to be used in place of that term.

Equidae:  The Latin name for the horse family (pronounced ek' wa de).

Equine:  Scientific name for horses and ponies.

Equus:  The Latin name for horse (pronounced e'kwus).

Ergot:  A rounded, wartlike, vestigial growth, in the tufts of hair on the back of the fetlock.  In the horse it averages about a half-inch in diameter.  In asses and zebras it is much larger.  From the French ergot, meaning spur.

Euthanize:  Medical term for destroying an animal.  It is usually performed by injecting a deadly substance into the vein.  The animal goes to sleep and never wakes.  It is painless and fast.

Event horse:  Used in horse trials, which include dressage, show jumping, and cross-country riding.