Parfocal

Par*fo"cal

(?), a. [Pari- + focal.] (Opt.) 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. "the convenience of a microscope with parfocal objective lenses"
[Webster 1913 Suppl.]

{

Par*forn"

(?),

Par*fourn"

(?) }, v. t. To perform. [Obs.] Chaucer. Piers Plowman.
[1913 Webster]

 

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Thu 13th December 2018