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Characterizing the ovum when it has two primary germinal layers.

Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg.

One of the dark particles forming the doubly refracting disks of muscle fibers.

A coarse linen cloth made in the north of England and in Scotland, now nearly replaced by calico. Shak.

The outer layer of the blastoderm; the epiblast; the ectoderm.

The outer transparent layer of protoplasm in a developing ovum.

Pertaining to, or composed of, ectoplasm.

A small sandglass, running about three minutes, for marking time in boiling eggs; also, a small glass for holding an egg, at table.

p sea. They are remarkable for their bilateral symmetry and curious forms. [Written also Elasmopoda.]

Of or pertaining to the Elasmobranchii. -- n.

Of or pertaining to Elasmobranchii. -- n.

A subclass of fishes, comprising the sharks, the rays, and the Chimæra. The skeleton is mainly cartilaginous.

An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus.

bent, drawn, pressed, or twisted; springy; having the power of rebounding; as, a bow is elastic; the air is elastic; India rubber is elastic. Capable of being drawn out by force like a piece of elastic gum, and by its own elasticity returning, when the force is removed, to its former position. Paley.…

Elastic. [R.] Bentley.

In an elastic manner; by an elastic power; with a spring.

The quality of being elastic; the inherent property in bodies by which they recover their former figure or dimensions, after the removal of external pressure or altering force; springiness; tendency to rebound; as, the elasticity of caoutchouc; the elasticity of the air.

The quality of being elastic; elasticity.

A nitrogenous substance, somewhat resembling albumin, which forms the chemical basis of elastic tissue. It is very insoluble in most fluids, but is gradually dissolved when digested with either pepsin or trypsin.

Relating to, or aiding in, the formation of an embryo; as, embryoplastic cells.