Bible Dictionaries
Parfocal
Webster's Dictionary
(a.) With the lower focal points all in the same plane; - said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used.
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Bibliography Information
Webster, Noah. Entry for 'Parfocal'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/parfocal.html. 1828.