A diagonal groin or rib of a vault, two of which cross each other at the vault's centre; = ogive, n. 1. Also: a stone used in such a rib. Obsolete…

One of the stones which form part of an arch or a vault, usually having the sides slightly inclined towards each other.

A bay or compartment of a vaulted roof. Also, a compartment or section of scaffolding.

(a) A blank or blind window; a blank or plain stone panel. (b) A circular boss or quatrefoil.

A stone cut to serve as a scuncheon. Obsolete.

Anything shaped like an escutcheon. Architecture. (See quots.)

Architecture. A round decorative band or wreath. Obsolete. rare.

Architecture and Building. In an open timber roof: a supporting post attached to the hammerbeam or the principal rafter; a pendant-post; a spandrel…

Architecture. The edge formed by the intersection of two vaults. Also, the rib or fillet of stone or wood with which this is usually covered.

The action of groin, v.2 (sense 2); concrete the result of this, groined work, a groin or arrangement of groins.

One of the ribs extending diagonally from one pier to another in groined vaulting.

Architecture. An ornamental projection in a vault at the intersection of the ribs.

see quot.

Used attributively in scoinson arch = rear arch, n.; also in scoinson shaft.

The curved surface of two adjacent groins in a vault.

the stone fixed at the intersection of the ribs in groined vaulting.

Groins or groined work.