Epicoele \Ep"i*coele\ ([e^]p"[i^]*s[=e]l), n. [Pref. epi- + Gr.
koi^lon a hollow.] (Anat.)
A cavity formed by the invagination of the outer wall of the
body, as the atrium of an amphioxus and possibly the body
cavity of vertebrates.
[1913 Webster]