RETROCHOIR Meaning of RETROCHOIR in English [ 'rɛtrəʊˌkwʌɪə ]■ noun the part of a cathedral or large church behind the high altar.OriginC19: from med. L. retrochorus (see retro- , choir ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004