thumb in WordNet English dictionary

1. feel or handle with the fingers
   "finger the binding of the book"
   finger  thumb 
   
2. look through a book or other written material
   "He thumbed through the report"; "She leafed through the volume"
   flick  flip  thumb  riffle  leaf  riff 
   
3. travel by getting free rides from motorists
   hitchhike  hitch  thumb 
   

1. a convex molding having a cross section in the form of a quarter of a circle or of an ellipse
   ovolo  thumb  quarter round 
   
2. the thick short innermost digit of the forelimb
   thumb  pollex 
   
3. the part of a glove that provides a covering for the thumb
   thumb