| 1. | a plate of glass for filling a window sash within the frame. |
| 2. | a flounder, Scophthalmus aquosus, occurring along the Atlantic coast of North America, characterized by the thinness and translucency of its body. |
| 3. | designating or having a large, regular design of intersecting lines resembling a series of windowpanes: a windowpane plaid sweater. |