Ox-eye window
Ox-eye window is a relatively small oval window, typically for an upper story, and sometimes set on a roof slope as a dormer or above a door to give light. Windows of this type are commonly found in the grand architecture of Baroque France. The term is also often applied to similar round windows, like those found in Georgian architecture in Great Britain and later Greek Revival and Colonial Revival styles in North America. This must be considered part of the usage. The term initially applied to horizontal oval windows but is also used for vertical ones.
View this country house plan with an ox-eye window and corner porch.