One of the mysteries of the English language finally explained.
Any of various instruments used to measure thickness, originally of the glass of mirrors, but later also of paper, concrete, etc.; (Ophthalmology) an instrument for measuring the thickness of the cornea of the eye, typically using either light from a slit lamp or ultrasound.
Mid 19th century; earliest use found in Robert Mayne (1808–1868). From French pachomètre from ancient Greek πάχος thickness or παχύς thick + French -omètre.
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