Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.
  • n. The upturned edge of a roof which acts as a gutter; a cyma.

from the GNU version of the Collaborative International Dictionary of English

  • n. A cyma.

from The Century Dictionary and Cyclopedia

  • n. In architecture, an erroneous spelling of cyma.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium

Etymologies

si(lica) + ma(gnesium).
(American Heritage® Dictionary of the English Language, Fourth Edition)
Si (silicon) + Ma (magnesium) (Wiktionary)

Examples

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