Definition of Must

Noun

• the quality of smelling or tasting old or stale or mouldy
  mustiness moldiness
• grape juice before or during fermentation
  
• a necessary or essential thing
  "seat belts are an absolute must"
  

Adjective

• highly recommended
  "a book that is must reading"
  

• Scrabble® score of the must (6)
• Word Chums® score of the must (9)
• Words With Friends® score of the must (8)