Definitions for "Multi-User Dungeon"
A game on the Internet very similar to IRC. Users solve puzzles, find clues, and interact with other players in hopes of mastering the game.
Adventures, role playing games, or simulations played on the Internet. Devotees call them "text-based virtual reality adventures". Players interact in real time and can modify the "world" in which the game is played. Most MUDs are based on the Telnet protocol.
(abbreviation: MUD) An online fantasy role-playing game environment that takes place in telnet sessions. MUDs occur in text mode -- similar to a chat environment -- where the players assume the identities of fictional characters and follow a series of rules which guide the adventure.