Enter a clue or pattern or both:
The Clue
Arched ceilings or vaults (8 letter answer)
The Answer
TESTUDOS
Tags
Notes
The answer TESTUDOS is so rare that it appears less than once every 2500 puzzles.
Definition
TESTUDO as a noun:
1. a movable protective covering that provided protection from above; used by Roman troops when approaching the walls of a besieged fortification
2. (Testudo, genus Testudo) = type genus of the Testudinidae