Sn. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work ; Sn. the 19th letter of the Roman alphabet ; Sn. a unit of conductance equal to the reciprocal of an ohm ; Sn. the cardinal compass point that is at 180 degrees ; Sn. an abundant tasteless odorless multivalent nonmetallic element ; best known in yellow crystals ; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions) ; sn. 1/60 of a minute ; the basic unit of time adopted under the Systeme International d'Unites ; S wrenchn. a wrench with an S-shaped handle ; S-shapen. a double curve resembling the letter S ; s-shapedadj. shaped in the form of the letter S ; S. S. Van Dinen. United States writer of detective novels (1888-1939) ; S. Smith Stevensn. United States psychologist and psychophysicist who proposed Stevens' power law to replace Fechner's law (1906-1973) ; S.C.n. a state in the Deep South ; one of the original 13 colonies ; S.D.n. a state in north central United States ; s.t.p.n. standard temperature and pressure ; S.U.V.n. a high-performance four-wheel drive car built on a truck chassis ;
