Search Result for "thumbhole": 
Wordnet 3.0

NOUN (2)

1. the hole in a woodwind that is closed and opened with the thumb;

2. a finger hole made to fit the thumb (as in a bowling ball); 



WordNet (r) 3.0 (2006):

thumbhole
    n 1: the hole in a woodwind that is closed and opened with the
         thumb
    2: a finger hole made to fit the thumb (as in a bowling ball)