
1) Architectural rib 2) Gothic re-enforcing rib 3) Gothic rib 4) Rib in Gothic vaulting 5) Rib of a Gothic vault 6) Type of arch
Found on
https://www.crosswordclues.com/clue/lierne
[vault] A Lierne (from the French lier - to bind) in Gothic rib vaulting is an architectural term for a tertiary rib spanning between two other ribs, instead of from a springer, or to the central boss. The type of vault that utilizes liernes is called a lierne vault or stellar vault (named after the star shape generated by connecting lierne...
Found on
http://en.wikipedia.org/wiki/Lierne_(vault)

A minor rib in a complex rib vault. Liernes do not spring from the main springers.
Found on
http://www.pitt.edu/~medart/menuglossary/INDEX.HTM
No exact match found.