MUD1

1. noun version 3A (sometimes also 3B) of MUD, from which most other MUAs are directly descended. incarnations include Essex ((MUD:essex_mud)), Compunet ((MUD:compunet_mud)) and (as version 3B) BL.

2. noun The particular incarnation of MUD1 at Essex University; the first MUD to be played by externals. It may sometimes be called MUD-1 by users of InterNet.

3. noun The MUD1 rooms of MUD2's database.