nibble in WordNet English dictionary

1. gentle biting
   nibble 
   
2. a small byte
   nybble  nibble 
   

1. eat intermittently; take small bites of
   "He pieced at the sandwich all morning"; "She never eats a full meal--she just nibbles"
   nibble  pick  piece 
   
2. bite off very small pieces
   "She nibbled on her cracker"
   nibble 
   
3. bite gently
   "The woman tenderly nibbled at her baby's ear"
   nibble