A horse, a steed; (in later use spec.) a mare. Also: an ass.

A domesticated animal used for riding, driving, carrying loads, etc., as a horse or donkey; a draught animal, a pack animal.

A beast of burden, also a beast in general.

singular. A beast of burden, a draught ox or horse; hence, spec. a horse used for heavy work, a cart-horse; and in later usage, in northern dialect…

A packhorse or (occasionally) other working animal used to carry loads. Cf. compounds 1.

= sumpter, n. (in various senses); esp. (a) a packhorse or mule; (b) a saddleback or other pack carried on an animal. Often as a modifier; cf. sumpter…

an animal, such as a mule, donkey, or ox, that is used for carrying or pulling heavy loads; = beast of burden at burden, n. 7.

The bearing of loads, as in beast of burden, ship of burden (= merchant-ship).

As a modifier. Designating a packhorse or (occasionally) other working animal used to carry loads; (also sometimes) designating a vehicle used to…

An animal used for carrying a pack or packs.

(a) an untrained pack animal, identified by a shaven tail; also attributive; (b) figurative a newly commissioned officer, spec. a second lieutenant…

One who carries or has charge of baggage. Also, a beast that carries baggage; a baggage horse, camel, etc.

Australian and New Zealand. A pack animal; esp. a packhorse. Now rare.

Australian and North American. An animal used to carry packs.