S: (n) sulfur, S, sulphur, atomic number 16 (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))
S: (n) randomness, entropy, S ((thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work) "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity"