time unit, unit of time - a unit for measuring time periods

min, minute - a unit of time equal to 60 seconds or 1/60th of an hour; "he ran a 4 minute mile"

leap second - a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth's rotation

millisecond, msec - one thousandth of a second

chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

brimstone, native sulfur, native sulphur - an old name for sulfur

sulfide, sulphide - a compound of sulphur and some other element that is more electropositive

oil of vitriol, sulfuric acid, sulphuric acid, vitriol - (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry

cardinal compass point - one of the four main compass points

conductance unit - a measure of a material's ability to conduct an electrical charge

Latin alphabet, Roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"

physical property - a property used to characterize physical objects

conformational entropy - entropy calculated from the probability that a state could be reached by chance alone

thermodynamics - the branch of physics concerned with the conversion of different forms of energy