Horse

noun

1. Any of several animals related to Equus ferus caballus.
2. Equipment with legs.
3. Type of equipment.
4. 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.
5. The sedative, antidepressant, and anxiolytic drug morphine, chiefly when used illicitly.