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1. A female person who has the same parents as another person
   "my sis married a musician"
   - sister

1. The syllable naming the seventh (subtonic) note of any musical scale in solmization
   - ti, te

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
   - silicon, atomic number 14

1. 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)
   "Today the United States is the only country in the world not totally committed to the SI system"; "Today the United States is the only country in the world not totally committed to the SI"; "Today the United States is the only country in the world not totally committed to the SI unit"
   - Système International d'Unités, Système International, SI system, SI unit, International System of Units, International System

Type of: chemical element, element, female sibling, metric system, semiconducting material, semiconductor, solfa syllable

Part of: clay, feldspar, felspar, granite, quartz, sand, silicone, silicone polymer

Encyclopedia: SI