a. [ Gr. &unr_; to throw upon, add to; 'epi` upon + &unr_; to throw. ] (Biol.) Growing or covering over; -- said of a kind of invagination. See under Invagination. [ 1913 Webster ]

n. [ Cf. Gr. &unr_; a throwing upon. ] (Biol.) Epibolic invagination. See under Invagination. [ 1913 Webster ]