Definition of MUD noun from the Oxford Advanced Learner's Dictionary

 

MUD

 noun
noun
BrE BrE//mʌd//
 
; NAmE NAmE//mʌd//
 
(computing) Video games, Social networking
 
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the abbreviation for multi-user dungeon/dimension (a computer game played over the Internet by several players at the same time) See related entries: Video games, Social networking Word Origin 1980s: from multi-user dungeon or multi-user dimension.
See the Oxford Advanced American Dictionary entry: MUD