Etymology
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tracery (n.)

mid-15c., "a place for drawing," formed in English from trace (v.) + -ery. Architectural sense, in reference to intersecting rib work in the upper part of a gothic window, is attested from 1660s. "Introduced by Wren, who described it as a masons' term" [Weekley].

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Definitions of tracery

tracery (n.)
decoration consisting of an open pattern of interlacing ribs;
From wordnet.princeton.edu