Alum rock
a town in W central California, near San Jose.
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- Alumroot
any of several North American plants belonging to the genus Heuchera, of the saxifrage family, especially H. americana, having mottled foliage and greenish-white flowers. the of any of these plants, used as an astringent. noun any of several North American plants of the saxifragaceous genus Heuchera, having small white, reddish, or green bell-shaped flowers and […]
- Alunite
a mineral, a hydrous sulfate of potassium and aluminum, KAl 3 (SO 4) 2 (OH) 6 , commonly occurring in fine-grained masses. Historical Examples Of other natural mineral sources, alunite is the most important. The Economic Aspect of Geology C. K. Leith One of the interesting features of this occurrence is the abundance of alunite. […]
- Alumin-
variant of , especially before a vowel.
- Alumina
the natural or synthetic oxide of aluminum, Al 2 O 3 , occurring in nature in a pure crystal form as corundum. Historical Examples The garnet is but as hard as quartz, and is a silicate of alumina with lime and a little iron. The A B C of Mining Charles A. Bramble It is […]
- Alumina cement
a quick-setting cement with a large bauxite content.