windows: holes in walls used to look out of and to provide light; usually these days the hole is filled with a sheet of glass.
![43. St. Margarets at Cliffe, Kent, with its Normon clerestory [interior view]](https://tn.fromoldbooks.org/Howard-MediaevalEnglishChurches/wm/big/044-cliffe-church-kent-interior-q85-267x200.jpg "43. St. Margarets at Cliffe, Kent, with its Normon clerestory [interior view], from Mediæval Styles of the English Parish Church, by Howard, F. E.")
