CHORIOALLANTOIC Meaning of CHORIOALLANTOIC in English [ ˌkɔ:rɪəʊˌalən'təʊɪk , ˌkɒrɪəʊ- ]■ adjective Embryology relating to or denoting fused chorionic and allantoic membranes around a fetus. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004