The Collaborative International Dictionary of English v.0.48:

Earthenware \Earth"en*ware`\, n.
   Vessels and other utensils, ornaments, or the like, made of
   baked clay. See Crockery, Pottery, Stoneware, and
   Porcelain.
   [1913 Webster]

WordNet (r) 3.0 (2006):

earthenware
    n 1: ceramic ware made of porous clay fired at low heat