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 1 [..]

Ornamentation of panels, circular windows, window heads, etc… A curving mullion of a stone window, as in Gothic architecture.

Stone openwork pattern in head of Gothic window, screen, etc.    (Wood, Margaret. The English Medieval House, 415)

Cut out of a solid surface.    (Wood, Margaret. The English Medieval House, 415)

1) Made up of moulded bars forming geometrical figures, etc.    (Wood, Margaret. The English Medieval House, 415) 2) So called from its resemblance to iron bars bent to the forms required. (archit [..]

(n) decoration consisting of an open pattern of interlacing ribs

Openwork pattern of masonry or wood in the upper part of an opening e.g window or screen. See Blind Tracery , Y-Tracery , Reticulated .

the geometrical architectural ornamentation which is used in Gothic architecture to subdivide the upper parts of the arches belonging to large windows, and later to subdivide gable ends, walls, and ot [..]

(architecture) bars or ribs, usually of stone or wood, or other material, that subdivide an opening or stand in relief against a door or wall as an ornamental feature. A delicate interlacing of li [..]