doublet (etymology)
Definition - Two different words that derive from the same foreign word.
Note: These are also called etymological twins.

Example -

(1) The words frail and fragile are doublets that both derived from the Latin fragilis, fragile.
(2) The words aperture and overture both derived from the Latin aperire, to open.

Etymology -
The word derives from the French doublet, which was coined as a diminutive of double.

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