Batement light
Batement lights, in architecture, are the lights in the upper part of a perpendicular window, which are abated, or only half the width of those below.
References
- This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Batement light"