1.  windowpane(n = noun.artifact) window - a pane of glass in a window; "the ball shattered the window"
is a kind of pane, pane of glass, window glass
is a part of window

2.  windowpane(n = noun.animal) scophthalmus aquosus - very thin translucent flounder of the Atlantic coast of North America;
is a kind of lefteye flounder, lefteyed flounder
is a member of genus scophthalmus, scophthalmus

1.  See Pane, n., (3) b. [1913 Webster]

2.  A thin, spotted American turbot (Pleuronectes maculatus) remarkable for its translucency. It is not valued as a food fish. Called also spotted turbot, daylight, spotted sand flounder, and water flounder. [1913 Webster]

windowpane oyster