horse

Any member of the species Equus ferus, including the Przewalski's horse and the extinct Equus ferus ferus.

(zoology) Any current or extinct animal of the family Equidae, including zebras and asses.

(military, sometimes uncountable) Cavalry soldiers (sometimes capitalized when referring to an official category).

(chess, informal) The chess piece representing a knight, depicted as a horse.

(slang) A large and sturdy person.

(historical) A timber frame shaped like a horse, which soldiers were made to ride for punishment.

In gymnastics, a piece of equipment with a body on two or four legs, approximately four feet high, sometimes (pommel horse) with two handles on top.

A frame with legs, used to support something.

A rope stretching along a yard, upon which men stand when reefing or furling the sails; footrope.

A breastband for a leadsman.

An iron bar for a sheet traveller to slide upon.

A jackstay.

(mining) A mass of earthy matter, or rock of the same character as the wall rock, occurring in the course of a vein, as of coal or ore; hence, to take horse (said of a vein) is to divide into branches for a distance.

(slang) The sedative, antidepressant, and anxiolytic drug morphine, chiefly when used illicitly.

(US) An informal variant of basketball in which players match shots made by their opponent(s), each miss adding a letter to the word "horse", with 5 misses spelling the whole word and eliminating a player, until only the winner is left. Also HORSE, H-O-R-S-E or H.O.R.S.E. (see H-O-R-S-E on Wikipedia.Wikipedia).

(uncountable) The flesh of a horse as an item of cuisine.

(prison slang) A prison guard who smuggles contraband in or out for prisoners.

(dated, slang, among students) A translation or other illegitimate aid in study or examination.

(dated, slang, among students) Horseplay; tomfoolery.