Meaning of low-side window in English:

low-side window

Pronunciation /ˌləʊˌsʌɪd ˈwɪndəʊ/

noun

Architecture
  • In some medieval churches: a small window lower than the other windows and typically situated in the chancel.

    The purpose of these windows is uncertain and has been the subject of much debate; they were popularly believed to provide a means by which lepers could view the altar.

Origin

Early 19th century; earliest use found in Thomas Rickman (1776–1841), architect. From low + side + window.