Wordnet 3.0
NOUN (1)
1.
a biter who takes dainty repeated bites;
The Collaborative International Dictionary of English v.0.48:
Nibbler \Nib"bler\, n.
One who, or that which, nibbles.
[1913 Webster]
WordNet (r) 3.0 (2006):
nibbler
n 1: a biter who takes dainty repeated bites