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French scale (F),
a scale for grading sizes of sounds, tubes, and catheters as based on a diameter of 0.33 mm equaling 1 F on the scale (for example, 3 F = 1 mm); grading to scale is carried out using a metal plate with holes ranging from 0.33 mm to 1 cm in diameter.
Synonym(s): Charrière scale
Frenchadjective (slang) Referring to oral sex.
(1) To perform oral sex on someone.
(2) To give an open-mouth (i.e., “French”) kiss.