Mule (noun)

1. The offspring of a male donkey and a female horse, typically sterile and used as a beast of burden.
2. A stubborn or obstinate person.

Origin:

Middle english: from old french, from latin mulus, from greek mulos.

Examples:

1. He used a mule to pull the plow.
2. She rode the mule through the mountains.
3. The mule was known for its strength and endurance.
4. He was called a mule because he was stubborn.
5. The mule was a cross breed between a donkey and a horse.