any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals.
alkaline-earth metal n.
Any of a group of metallic elements including calcium, strontium, magnesium, barium, beryllium, and radium.
Any of a group of metallic elements that includes beryllium, magnesium, calcium, strontium, barium, and radium. Because the alkaline-earth metals have two electrons in their outer shell, they react easily with other elements and are found in nature only in compounds. See Periodic Table.
- Alkaline phosphatase
a phosphatase active in an alkaline medium. alkaline phosphatase n. A phosphatase with an optimum functioning at pH 8.6; it is present throughout the body.
- Alkaline soil
noun a soil that gives a pH reaction of 8.5 or above, found esp in dry areas where the soluble salts, esp of sodium, have not been leached away but have accumulated in the B horizon of the soil profile Historical Examples Do any of the nut tree species prefer an acid to an alkaline […]
- Alkaline tide
alkaline tide alkaline tide n. A period of urinary neutrality or alkalinity after meals.
- Alkaline-ash diet
alkaline-ash diet alkaline-ash diet n. A diet consisting mainly of fruits, vegetables, and milk with little meat, fish, eggs, cheese, and cereals, that when catabolized leaves an alkaline residue to be excreted in the urine.