Definitions for "Lierne"
Keywords:  vault, tierceron, gothic, rib, arch
A short subsidiary rib connecting two main ones. (Martindale, Andrew. Gothic Art, 269)
Short rib that fills spaces between tiercerons. Should be carefully differentiated from the short ribs that result from splitting major ribs such as tiercerons, diagonal ribs and transverse arches. Liernes do not pretend to be structural.
purely decorative extra vaulting ribs joining the structural ribs to form a net-like pattern