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A square hall lighted from above, into which rooms open at one or more levels.

The technical name for sodium.

Of or pertaining to an atrium.

A cavity formed by the invagination of the outer wall of the body, as the atrium of an amphioxus and possibly the body cavity of vertebrates.

In Roman dwellings, a cistern or tank, set in the atrium or peristyle to recieve the water from the roof, by means of the compluvium; generally made ornamental with flowers and works of art around its birm.

The portico in front of ancient churches; sometimes, the atrium or outer court surrounded by ambulatories; -- used, generally, for any vestibule, lobby, or outer porch, leading to the nave of a church.

other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 23. Specific gravity 0.97. Sodium amalgam, an alloy of sodium and mercury, usually produced as a gray metallic crystalline substance, which is used as a reducing agent, and otherwise. -- Sodium bicarbonate,…

r sometimes of the initial letter with a following one; as, C for carbon, Na for sodium (Natrium), Fe for iron (Ferrum), Sn for tin (Stannum), Sb for antimony (Stibium), etc. See the list of names and symbols under Element.