sima

si·ma

1 [sahy-muh]
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.

Origin:
< German (1909), equivalent to Latin si(licium) silicium + ma(gnesium) magnesium

si·mat·ic [sahy-mat-ik] , adjective
Dictionary.com Unabridged

si·ma

2 [sahy-muh] ,
noun Architecture.
the uppermost member of a full classical order, usually a cyma recta, representing a roof gutter; cymatium.

Origin:
variant of cyma

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Sima is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
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sima (ˈsaɪmə) [Click for IPA pronunciation guide]
 
n
1.  the silicon-rich and magnesium-rich rocks of the earth's oceanic crust, the most abundant individual rock being basalt
2.  the earth's continental lower crust, probably comprised of gabbro rather than basalt
 
[C20: from si(lica) + ma(gnesia)]
 
simatic
 
adj

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