The Collaborative International Dictionary of English v.0.48:
Beechen \Beech"en\, a. [AS. b?cen.] Consisting, or made, of the wood or bark of the beech; belonging to the beech. "Plain beechen vessels." --Dryden. [1913 Webster]WordNet (r) 3.0 (2006):
beechen adj 1: consisting of or made of wood of the beech tree