The Collaborative International Dictionary of English v.0.48:
Earthen \Earth"en\ ([~e]rth"'n), a. Made of earth; made of burnt or baked clay, or other like substances; as, an earthen vessel or pipe. [1913 Webster]WordNet (r) 3.0 (2006):
earthen adj 1: made of earth (or baked clay); "an earthen pot"