English > Si: 3 senses > noun 1, substance| Meaning | A tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors. |
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| Synonyms | silicon, atomic number 14 |
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| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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| semiconductor, semiconducting material | A substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator |
| Substance of | clay | A very fine-grained soil that is plastic when moist but hard when fired |
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| feldspar, felspar | Any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium |
| granite | plutonic igneous rock having visibly crystalline texture |
| quartz | A hard glossy mineral consisting of silicon dioxide in crystal form |
| sand | A loose material consisting of grains of rock or coral |
| silicone, silicone polymer | Any of a large class of siloxanes that are unusually stable over a wide range of temperatures |
| Spanish | número atómico 14, silicio, Si |
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| Catalan | número atòmic 14, silici, Si |
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