'Retrochoir' definitions:

Definition of 'Retrochoir'

From: GCIDE
  • Retrochoir \Re"tro*choir\, n. [Pref. retro- + choir.] (Eccl. Arch.) Any extension of a church behind the high altar, as a chapel; also, in an apsidal church, all the space beyond the line of the back or eastern face of the altar. [1913 Webster]