n. In architecture: Any system of vaulting implying the intersection at any angle of simple vaults.
n. The general scheme or plan of the groins in such a system of vaulting.
n. Same as groin, 2.
Word Usage
"This remarkable effect was produced by the depth of the eye-socket, under which the eye moved free from its setting; the arch of the brow was so accurate as to resemble the groining of a vault."