si

Meanings

Plural: sis

Noun

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
A syllable used in solfège to represent the seventh note of a major scale.

Origin / Etymology

From Middle English si (“seventh degree or note of Guido of Arezzo's hexachordal scales”), Italian si in the solmization of Guido of Arezzo, from the initials of Latin Sāncte Iohannēs (“Saint John (the Baptist)”) in the lyrics of the scale-ascending hymn Ut queant laxis by Paulus Deacon; thus, also an initialism of Sāncte Iohannēs.

Synonyms

atomic number 14, International System, International System of Units, SI system, SI unit, silicon, Systeme International, Systeme International d'Unites, te, 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