proamnion

pro·am·ni·on

noun \-ˈam-nē-ˌän, -ən\

plural pro·am·ni·ons or -nia \-nē-ə\

Definition of PROAMNION

: an area in the anterior part of the blastoderm of an early amniote embryo that is free of mesoderm

—pro·am·ni·ot·ic \-ˌam-nē-ˈät-ik\ adjective