mule

1. (now rare) A hybrid plant.Examples: "Vegetable mules supply an irrefragable argument in favour of the sexual system of botany."; "The most extraordinary mule, however, that is asserted to have been produced on the Continent, is a cross between the cabbage and horse-radish, which Monsieur Sageret reports that he has obtained […]"archaic

2. (informal) A stubborn person.Examples: ""Where in the hell do you think I learned to be such a mule?”"Synonyms: donkey, bulldog, muleinformal

3. (slang) A person paid to smuggle drugs.Examples: "Cocaine packet ingestion (these patients referred to as “mules”) may warrant surgery, Golytely or expectant passage."; "“Yeah, in Denver, we know about Uriarte's involvement in meth. Our Las Cruces office seized over six hundred pounds of methamphetamine from two of his mules last year.”"Synonyms: drug muleslang

4. (numismatics) A coin or medal minted with obverse and reverse designs not normally seen on the same piece, either intentionally or in error.Examples: "What is less clear, however, is why mint workers should have chosen to produce mules, if they were making forgeries […]"

5. (roleplaying games) A MMORPG character, or NPC companion in a tabletop RPG, used mainly to store extra inventory for the owner's primary character.Examples: "He was in the middle of organizing his massive stash of rare and exquisite bounty, all kept safely in the inventory cache of a mule, an entirely separate character which he paid a monthly fee to maintain exclusively for that purpose."

6. (sailing) A kind of triangular sail for a yacht.Examples: "In heavier seas where a boat must sail a course dictated by waves, or where wave action makes power more important than pointing, the mule will prove the faster sail."