The Collaborative International Dictionary of English v.0.48:

Estonian \Estonian\ n.
   a native or inhabitant of Estonia.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Estonian \Estonian\ adj.
   of or pertaining to Estonia.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

Estonian
    adj 1: of or pertaining to Estonia or the people or culture of
           Estonia
    n 1: the official language of Estonia; belongs to the Baltic-
         Finnic family of languages [syn: Estonian, Esthonian]