si
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1. the syllable naming the seventh (subtonic) note of any musical scale in solmization (noun.communication)
| hypernym | : | solfa syllable, |
| definition | : | one of the names for notes of a musical scale in solmization (noun.communication) |
2. a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela) (noun.quantity)
| hypernym | : | metric system, |
| definition | : | a decimal system of weights and measures based on the meter and the kilogram and the second (noun.quantity) |
3. 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 (noun.substance)
| hypernym | : | chemical element, element, |
| definition | : | 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 (noun.substance) |
| hypernym | : | semiconducting material, semiconductor, |
| definition | : | a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities (noun.substance) |
| substance meronym | : | quartz, |
| definition | : | a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities (noun.substance) |
| substance meronym | : | clay, |
| definition | : | a very fine-grained soil that is plastic when moist but hard when fired (noun.substance) |
| substance meronym | : | feldspar, felspar, |
| definition | : | any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium (noun.substance) |
| substance meronym | : | granite, |
| definition | : | plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz (noun.substance) |
| substance meronym | : | sand, |
| definition | : | a loose material consisting of grains of rock or coral (noun.substance) |
| substance meronym | : | silicone, silicone polymer, |
| definition | : | any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation (noun.substance) |
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