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Webster 1913 Edition

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Noun.

[F.]

A slope or declivity in a manege ground down which a horse is made to gallop, to give suppleness to his haunches.

Noun.

The slope or declivity of a rising manege-ground.

calade ‎(plural calades)

A slope or declivity in a manège ground down which a horse is made to gallop, to give suppleness to its haunches.
- 1735, The Sportsman's Dictionary
  Work your horse in a calade, after the Italian way; ride him straight, and then you make good use of the calade.

calade f ‎(plural calades)

a harmonious, decorative and useful arrangement of medium-sized pebbles, fixed to the ground