li·erne
(le-ûrn)
(le-ûrn)n.
A subordinate rib used in Gothic vaulting to connect the intersections and bosses of the primary ribs.
[French, fromlier, to bind, fromOld French; see LIABLE.]
lierneA. boss
B. diagonal ribs
C. ridge ribs
D. transverse rib
E. liernes
F. tiercerons