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.

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.