Basic Guidelines For English Spellings
READ THESE ARTICLES
noun
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.
Origin
Mid 19th century; earliest use found in Robert Mayne (1808–1868). From French pachomètre from ancient Greek πάχος thickness or παχύς thick + French -omètre.
Are You Learning English? Here Are Our Top English Tips
