noun, Geology.
an assemblage of rocks, rich in silica and magnesium, that constitutes the lower layer of the earth’s crust and is found beneath the ocean floors and the sial of continents.
noun, Architecture.
the uppermost member of a full classical order, usually a cyma recta, representing a roof gutter; cymatium.
the silicon-rich and magnesium-rich rocks of the earth’s oceanic crust, the most abundant individual rock being basalt
the earth’s continental lower crust, probably comprised of gabbro rather than basalt


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