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Yes, si is a Scrabble word!
...and is worth 2 points in Scrabble, and 2 points in Words with Friends
1. 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
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)
3. The syllable naming the seventh (subtonic) note of any musical scale in solmization
What Scrabble words can I make with the letters in si?
2 Letter Words