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That which is used to adulterate anything. -- a. Adulterating; as, adulterant agents and processes.

ard experience written in his wrinkles. Hawthorne. Advanced guard, a detachment of troops which precedes the march of the main body.

ont edge (in direction of motion) of a supporting surface; -- contr. with following edge, which is the rear edge.

The first of two or more surfaces arranged in tandem; -- contr. with following surface, which is the rear surface.

Superiority of state, or that which gives it; benefit; gain; profit; as, the advantage of a good constitution.

That which happens without design; chance; hazard; hap; hence, chance of danger or loss. Nay, a far less good to man it will be found, if she must, at all adventures, be fastened upon him individually. Milton.

Having opposite leaves, as plants which have the leaves so arranged on the stem.

One who, or that which, advertises.

A shield or protective armor; -- applied in mythology to the shield of Jupiter which he gave to Minerva. Also fig.: A shield; a protection.

The great epic poem of Virgil, of which the hero is Æneas.

an organ play. Campbell. Æolian attachment, a contrivance often attached to a pianoforte, which prolongs the vibrations, increases the

a closed vessel (as a globe or cylinder) with one or more projecting bent tubes, through which steam is made to pass from the vessel, causing it to revolve. [Written also eolipile.]

That which supplies with air; esp. an apparatus used for charging mineral waters with gas and in making soda water.

Microörganisms which live in contact with the air and need oxygen for their growth; as the microbacteria which form on the surface of putrefactive fluids.

Related to, or of the nature of, aërobies; as, aërobiotic plants, which live only when supplied with free oxygen.

A modification of the aëroplane, having curved surfaces, the advantages of which were first demonstrated by Lilienthal.

The science which treats of the air and other gaseous bodies under the action of force, and of their mechanical effects.

The science which treats of the properties of the air, and of the part it plays in nature. Craig.

A stone, or metallic mass, which has fallen to the earth from distant space; a meteorite; a meteoric stone.

That department of physics which treats of the atmosphere.