<p><strong>Noun</strong></p><ul><li>A plate of glass for filling a window sash within the frame.</li><li>A flounder, <em>Scophthalmus aquosus</em>, occurring along the Atlantic coast of North America, characterized by the thinness and translucency of its body.</li></ul><p><strong>Adjective</strong></p><ul><li>Designating or having a large, regular design of intersecting lines resembling a series of windowpanes: a windowpane plaid sweater.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) To treat (textile fibers) with a willow.</li></ul>