1) Situated outside the embryo 
Outside the embryonic body; e.g., those membranes involved with the embryo's protection and nutrition which are discarded at birth without being incorporated in its body. ... (05 Mar 2000) ... 
(eks″trә-em″bre-on´ik) external to the embryo proper, as the extraembryonic coelom or the extraembryonic membranes.
Type: Term Pronunciation: eks′tră-em′brē-on′ik Definitions: 1. Outside the embryonic body; the extraembryonic membranes involved with the embryo's protection and nutrition that are discarded at birth.
situated outside the embryo. · pertaining to structures outside the embryo.