noun: (Britain) Initialism of Georgius Rex. (on coins, letterboxes, etc.) The royal cypher for George V and his son George VI, kings of Great Britain
noun: (biochemistry) Initialism of glucocorticoid receptor. [(biochemistry) A protein found in multiple forms within cells, which binds glucocorticoids and subsequently influences gene transcription.]
noun: (physics) Initialism of general relativity. [(relativity) A theory extending special relativity and uniformly accounting for gravity and accelerated frames of reference, postulating that space-time curves in the presence of mass.]
noun: (sports) Initialism of games record.
noun: Abbreviation of grain, a unit of mass. [(uncountable) The harvested seeds of various grass food crops eg: wheat, corn, barley.]
noun: (rare) Abbreviation of gram; the standard symbol for gram since the International System of Units was introduced in 1960 is g. [A unit of mass equal to one-thousandth of a kilogram. Symbol: g.]
