retrochoir
noun
ret·ro·choir
ˈre‧trō+ˌ-,
sometimes ˈrē‧trō+ˌ-
1
: the space left in a church behind the high altar or choir enclosure sometimes used as a chapel and occasionally containing a second choir enclosure
2
: the space beyond the line of the eastern face of the altar in an apsidal church
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Merriam-Webster unabridged
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