The Collaborative International Dictionary of English v.0.48:

Hatrack \Hat"rack`\ (h[a^]t"r[a^]k`), n.
   A hatstand; hattree.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hatrack
    n 1: a rack with hooks for temporarily holding coats and hats
         [syn: coatrack, coat rack, hatrack]