Saddle n. : A seat for a rider, -- usually made of leather, padded to span comfortably a horse's back, furnished with stirrups for the rider's feet to rest in, and fastened in place with a girth; also, a seat for the rider on a bicycle or tricycle.

Saddle n. : A padded part of a harness which is worn on a horse's back, being fastened in place with a girth. It serves various purposes, as to keep the breeching in place, carry guides for the reins, etc.

Saddle n. : A piece of meat containing a part of the backbone of an animal with the ribs on each side; as, a saddle of mutton, of venison, etc.

Saddle n. : A block of wood, usually fastened to some spar, and shaped to receive the end of another spar.

Saddle n. : A part, as a flange, which is hollowed out to fit upon a convex surface and serve as a means of attachment or support.

Saddle n. : The clitellus of an earthworm.

Saddle n. : The threshold of a door, when a separate piece from the floor or landing; -- so called because it spans and covers the joint between two floors.

Saddle v. t. : To put a saddle upon; to equip (a beast) for riding.

Saddle v. t. : Hence: To fix as a charge or burden upon; to load; to encumber; as, to saddle a town with the expense of bridges and highways.

Example:
What Saddle pad is best to use when jumping?

Taxonomy
saddle, tree, horse, leather, stirrups, designs, seat, English saddle, western saddle, padding, cantle, horn, pommel, saddle tree, pads, treeless, English, horse and rider.

Defination from the web:
saddle is a supportive structure for a rider or other load, fastened to an animal's back by a girth. ... Today, modern saddle comes in a wide variety of styles, each designed for a specific equestrianism discipline, and require careful fit to both the rider and the horse. ...