The Collaborative International Dictionary of English v.0.48:
Trabeated \Tra"be*a`ted\, a. (Arch.) Furnished with an entablature. [1913 Webster]WordNet (r) 3.0 (2006):
trabeated adj 1: not arcuate; having straight horizontal beams or lintels (rather than arches) [syn: trabeated, trabeate]