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pouce

1

In France prior to adoption of the metric system, and in Haiti, Mauritius, and the Seychelles, 20ᵗʰ century, a unit of length, = ¹⁄₁₂ pied de roi de Paris, approximately 2.707 centimeters (about 1.066 inches).

In France under the Système Usuel, 1812-1840, the pouce = ¹⁄₃₆ meter, about 2.77... centimeters.

2

In Switzerland, 3 centimeters (about 1.181 inch). A French name for the unit called the Zoll in German-speaking cantons.

3

In Russia, = 1 inch, 18ᵗʰ century, reflecting the well-established use of the French language by the educated classes, but official adoption of a system of linear measures based on the English yard.