First Known Use: circa 1886
Dictionary
parfocal
adjective par·fo·cal \ˌpär-ˈfō-kəl\
Definition of PARFOCAL
: being or having lenses or lens sets (as eyepieces) with the corresponding focal points all in the same plane
— par·fo·cal·i·ty \ˌpär-fō-ˈka-lə-tē\ noun
— par·fo·cal·ize \ˌpär-ˈfō-kə-ˌlīz\ transitive verb
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Origin of PARFOCAL
Latin par equal + English focal
Medical Dictionary
parfocal
adjective par·fo·cal \(ˈ)pär-ˈfō-kəl\
Medical Definition of PARFOCAL
: having corresponding focal points all in the same plane : having sets of objectives or eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope) with which they are used
—par·fo·cal·i·ty \-fō-ˈkal-ət-ē\ noun, plural par·fo·cal·i·ties
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