Wordnet 3.0
NOUN (1)
1. 
 a round piece of luggage for carrying hats; 
The Collaborative International Dictionary of English v.0.48:
Hatbox \Hat"box`\ (-b[o^]ks`), n.
   A box for a hat.
   [1913 Webster]
WordNet (r) 3.0 (2006):
hatbox
    n 1: a round piece of luggage for carrying hats