teˈstü(ˌ)dō noun
Etymology: New Latin, from Latin, tortoise, tortoise shell, vault; akin to Latin testa shell — more at test (trial)
1. capitalized : a genus (the type of the family Testudinidae) of turtles comprising the typical land tortoises but formerly including all turtles — compare giant tortoise
2. -s : a protective screen (as a cover of overlapping shields held overhead or a shed wheeled up to a wall) used by an attacking force in ancient Rome
3. -s : an ancient Greek lyre believed to have been made of a tortoise shell
4. -s : an arched ceiling or vault especially when surbased