|n.||1.||(Arch.) Ornamental work with rambled lines.|
|2.||A similar decoration in some styles of vaulting, the ribs of the vault giving off the minor bars of which the tracery is composed.|
|2.||A tracing of lines; a system of lines produced by, or as if by, tracing, esp. when interweaving or branching out in ornamental or graceful figures.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.