groin.

1. The curved edge formed where two vault surfaces meet.

2. The area where the lower abdomen meets the upper thigh.

Use it for

Words that belong together

• groin vault
• the groins of the vault

On the page

Light traced the groins of the vault above the empty hall.

Usage notes

Primary category: architecture / spatial description. Forms: Singular groin; plural groins. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.