- Area opaca
the opaque area of the blastoderm surrounding the area pellucida. Historical Examples Junction between the white-yolk spheres and the hypoblast cells at the passage from the area pellucida to the area opaca. The Works of Francis Maitland Balfour, Volume IV (of 4) Francis Maitland Balfour Towards the end of the first day blood-vessels begin to […]
- Area pellucida
the translucent central area of the blastoderm of birds and reptiles within which the embryo develops. Historical Examples From the middle of this sickle a process next grows forward into the area pellucida. The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour They are almost entirely confined to the posterior part of the […]
- Area rug
a rug designed to cover only part of a floor.
- Area study
anthropological or sociological research intended to gather and relate data on various aspects of a geographical region and its inhabitants, as natural resources, history, language, institutions, or cultural and economic characteristics; a field investigation into human ecology.