Meaning of G in English

(LETTER) (plural G's or Gs), g (plural g's or gs) [noun] [C] - the 7th letter of the English alphabetA G-spot is a small area that is believed to be inside the vagina and to increase sexual pleasure when rubbed.A G-string is a narrow piece of cloth worn between a person's legs to cover their sexual organs that is held in place by a piece of string around their waist.

Cambridge English vocab.      Кембриджский английский словарь.