The Collaborative International Dictionary
Surbased
Surbased \Sur"based`\, a. (Arch.)
Having a surbase, or molding above the base.
[F. surbaiss['e].] Having the vertical height from springing line to crown less than the half span; -- said of an arch; as, a segmental arch is surbased.
Wiktionary
surbased
a. 1 (context of an arch English) having its height less than half of its span 2 having a surbase