What is bilaminar?

Some articles on bilaminar:

Bilaminar Blastocyst - Becoming Bilaminar
... hypoblast and epiblast, not including the amnion, is what contributes to the bilaminar embryonic disc (bilaminar blastoderm/blastocyst), which sits between the amniotic cavity and the ...
Bilaminar Blastocyst
... Bilaminar blastocyst or Bilaminar disc refers to the epiblast and the hypoblast, evolved from the embryoblast ... of the embryoblast are known collectively as the bilaminar embryonic disc as well as the bilaminar blastocyst or bilaminar blastoderm ... This bilaminar blastocyst also defines the primitive dorsal ventral axis ...