| infinitesimal | (noun) (mathematics) a variable that has zero as its limit | - |
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| planetesimal | (noun) one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system | - |
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| sima | (noun) rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium | - |
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| simal | (noun) East Indian silk cotton tree yielding fibers inferior to kapok | Synonyms: Bombax ceiba, Bombax malabarica, red silk-cotton tree |
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| simarre | (noun) a fur-lined coat decorated with braid, worn in the sixteenth century. | Synonyms: chamarre, chimer |
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| simazine | (noun) a herbicide used to control weeds (especially among crops) | - |
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