ETYM Old Eng. tile, tigel, as. tigel, tigol, from Latin tegula, from tegere to cover. Related to Thatch, Tegular.
1. A flat thin rectangular slab (as of fired clay or rubber or linoleum) used to cover surfaces of buildings.
2. A thin flat slab of fired clay used for roofing; SYN. roofing tile.

ETYM In this sense, written also window pane.
1. A pane in a window; SYN. window.
2. Very thin translucent flounder of the Atlantic coast of North America; SYN. Scophthalmus aquosus.
Window-pane, window pane.