The Collaborative International Dictionary of English v.0.48:

Cuspidor \Cus"pi*dor\ (-d?r), n. [Pg. cuspideria, fr. cuspir to
   spit.]
   Any ornamental vessel used as a spittoon; hence, to avoid the
   common term, a spittoon of any sort.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cuspidor
    n 1: a receptacle for spit (usually in a public place) [syn:
         spittoon, cuspidor]