1. The 19th letter of the Roman alphabet
   "In Spanish, the letter 'es' is pronounced like the English S";
   - S, es, ess
    
2. 1/60 of a minute; the basic unit of time adopted under the Système International d'Unités
   - second, sec

1. The cardinal compass point that is at 180 degrees
   "The migrating birds flew due S for the winter";
   - south, due south, southward
    
2. A unit of conductance equal to the reciprocal of an ohm
   "The engineer calculated the circuit's conductance in mhos"; "The wire's conductance was measured as 5 siemens"; "The engineer calculated the circuit's conductance in reciprocal ohms";
   - mho, siemens, reciprocal ohm
    
3. An abundant tasteless odourless 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, atomic number 16, is used in the production of sulphuric acid";
   - sulfur [N. Amer], sulphur [Brit, Cdn], atomic number 16
    
4. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
   - randomness, entropy

Derived forms: ss, Ss

Type of: alphabetic character, cardinal compass point, chemical element, conductance unit, element, letter, letter of the alphabet, physical property, time unit, unit of time

Part of: black powder, Latin alphabet, metabolic indican, min, minute, oil of vitriol, Roman alphabet, sulfide [N. Amer], sulfuric acid [N. Amer], sulphide [Brit, Cdn], sulphuric acid [Brit, Cdn], urinary indican, vitriol

Encyclopedia: S,S-Hydroxybupropion