1. The hole in a woodwind that is closed and opened with the thumb
   "The clarinettist covered the thumbhole to produce a lower note"
    
2. A finger hole made to fit the thumb (as in a bowling ball)
   "He carefully positioned his thumb in the thumbhole of the bowling ball before making his throw"

Derived forms: thumbholes

Type of: finger hole, hole

Part of: bowl, bowling ball, wood, woodwind, woodwind instrument