A membrane or cell layer, especially one in an embryo that later develops into a structure; the constituent cells of such layer.
A mold or matrix in which anything is cast or formed to a particular shape.
A clear component of blood or lymph containing fibrin.
A state of matter consisting of partially ionized gas and electrons.
A visual effect in which cycles of changing colours are warped in various ways to give the illusion of liquid organic movement.
Blood plasma, free of suspended cells, used in transfusions.
A variety of green quartz, used in ancient times for making engraved ornaments.