Maf·fi·o·so Ma·fi·o·so, n.; pl. -si .  A member of the mafia.
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  SI
       n 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 Systeme International d'Unites"
            [syn: Systeme International d'Unites, Systeme
            International, SI system, International System of
            Units, International System]
       2: 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 [syn: silicon, atomic
          number 14]
       3: the syllable naming the seventh (subtonic) note of any
          musical scale in solmization [syn: ti, te]