I. ˈgan-dər noun
Etymology: Middle English, from Old English gandra; akin to Old English gōs goose
Date: before 12th century
1. : an adult male goose
2. : simpleton
II. noun
Etymology: probably from gander (I); from the outstretched neck of a person craning to look at something
Date: circa 1914
: look , glance
take a gander