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Bible Dictionaries
Parfocal

Webster's Dictionary

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(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.

Bibliography Information
Webster, Noah. Entry for 'Parfocal'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/parfocal.html. 1828.
 
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