a. [f. as next + -AL.] Pertaining to a tortoise; shaped like a testudo; vaulted, arched.
1822. J. Fleming, Phil. Zool., II. 269. The testudinal animals are destitute of teeth.
1823. P. Nicholson, Pract. Build., 594. Testudinal Ceilings; those formed like the back of a tortoise.
1828. in Webster.
