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A gaseous element found in the atmospheres of the sun and earth and in some rare minerals.

The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See Epithelium.

mes restricted to the alimentary canal, the glands and their appendages, -- the term endothelium being applied to the lining membrane of the blood vessels, lymphatics, and serous cavities.

Same as Gorgerin.

Epithelial mesoderm; a layer of cuboidal epithelium cells, formed from a portion of the mesoderm during the differetiation of the germ layers. It constitutes the boundary of the coelum.

See Parhelion.

That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to Ant: aphelion.

ve substances, and shown to consist of positively charged particles (perhaps particles of helium) having enormous velocities but small masses. They are slightly deflected by a strong magnetic or electric field.

ounded by, cilia; as, a ciliate leaf; endowed with vibratory motion; as, the ciliated epithelium of the windpipe.

columns; having the form of a column or columns; like the shaft of a column. Columnar epithelium (Anat.), epithelium in which the cells are priismatic in form, and set upright on the surface they cover. -- Columnar structure (Geol.), a structure consisting of more or less regular columns, usually six-sided, but someti…

The deep layer of mucous membranes beneath the epithelium.

s the rays of light. It consists of rodlike cells derived from the external embryonic epithelium.

The external layer of the skin and mucous membranes; epithelium; ecderon. -- Ec`ter*on"ic, a.

Of, or relating to, endothelium.

Like endothelium.

Of or pertaining to epithelium; as, epithelial cells; epithelial cancer.

Like epithelium; as, epithelioid cells.

A brown, nitrogenous pigment contained in the retinal epithelium; a variety of melanin.

, or the space between two neck moldings; -- called also neck of the capital, and hypotrachelium. See Illust. of Column.

oring matter, soluble in ether, contained in the small round fat drops in the retinal epithelium cells. It is best obtained from the eyes of frogs.