AGE n.
A particular period of time in history, as distinguished from others; as, the golden age, the age of Pericles. "The spirit of the age." Prescott. Truth, in some age or other, will find her witness. Milton. Archeological ages are designated as three: The Stone age (the early and the later stone age, called paleolithic a…
ALKALI n.
One of a class of caustic bases, such as soda, potash, ammoma, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue. Fixed a…
ALKALI SOIL n.
otash, and usually a little lime and magnesia. Two main classes of alkali are commonly distinguished: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and white alkali, characterized by the presenc…