Definify.com

Webster 1913 Edition

(ĕp′ĭ-sēl)

Noun.

[Pref.

epi-

+ Gr.

κοῖλον

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.

See also: epicœle

epicoele ‎(plural not attested)

(anatomy) 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.