1. (noun) silicon, Si, atomic number 14
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
Synonyms: atomic number 14, silicon, te, ti
2. (noun) Systeme International d'Unites, Systeme International, SI system, SI, SI unit, International System of Units, International System
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)
Synonyms: atomic number 14, silicon, te, ti
3. (noun) ti, te, si
the syllable naming the seventh (subtonic) note of any musical scale in solmization
Synonyms: atomic number 52, titanium, atomic number 22, tellurium, si, ti, atomic number 14, silicon, te
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Synonyms for si 
