ret·​ro·​choir | \ˈre‧trō+ˌ-, sometimes ˈrē‧trō+ˌ-\

Definition of retrochoir 

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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History and Etymology for retrochoir

retro- + choir

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something that serves to warn or remind

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