tracery

English

Etymology

trace +‎ -ery

Noun

tracery (plural traceries)

1. (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.
2. A delicate interlacing of lines reminiscent of the architectural ornament.
   • 1881, Robert Louis Stevenson, Virginibus Puerisque:

     He is homesick for the hale rough weather; for the tracery of the frost upon his window-panes at morning, the reluctant descent of the first flakes, and the white roofs relieved against the sombre sky.