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Meaning of alkaline-earth metal

al'ka•line-earth' met"al

Pronunciation: (al'ku-līn"ûrth', -lin-), [key]
— Chem. Chem.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.