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Medical Definition of French scale
1. A scale for grading sizes of sounds, tubules, and catheters as based on a measurement of 1/3 mm and equaling 1 fr on the scale (e.g., 3 fr = 1 mm); grading to scale is carried out using a metal plate with holes ranging from 1/3 mm to 1 cm in diameter. Synonym: Charriere scale. (05 Mar 2000)