area opaca

[ oh-pey-kuh ]

noun

, Embryology.

1. the opaque area of the blastoderm surrounding the area pellucida.

Word History and Origins

Origin of area opaca¹

From New Latin

Example Sentences

Junction between the white-yolk spheres and the hypoblast cells at the passage from the area pellucida to the area opaca.

From Project Gutenberg

Towards the end of the first day blood-vessels begin to be developed in the inner part of the mesoblast of the area opaca.

From Project Gutenberg

The area vasculosa also grows round the yolk, and completely encloses it not long after the area opaca.

From Project Gutenberg

The narrow darker ring of blastoderm, outside the area pellucida, is the commencing area opaca.

From Project Gutenberg