Thumbhole Definition
 thŭmhōl 
    noun
  
 An opening for the insertion of a thumb, as to provide a firm hold.
 Webster's New World 
An opening in a wind instrument that is covered or uncovered with the thumb to produce certain notes.
 Webster's New World 
Other Word Forms of Thumbhole
Noun
Singular:
 thumbholePlural:
 thumbholesFind Similar Words
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