Wordnet 3.0
ADJECTIVE (1)
1. 
 not arcuate; 
 having straight horizontal beams or lintels (rather than arches); 
[syn: trabeated, trabeate]
WordNet (r) 3.0 (2006):
trabeate
    adj 1: not arcuate; having straight horizontal beams or lintels
           (rather than arches) [syn: trabeated, trabeate]