• 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
  • 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);
  • the syllable naming the seventh (subtonic) note of any musical scale in solmization
  • SI n pl. -S ti

Scrabble Score: 2

si is a valid Scrabble (US) TWL word

si is a valid Scrabble Word in Merriam-Webster MW Dictionary

si is a valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 2

si is a valid Words With Friends word