PARFOCAL
Adjective
parfocal (not comparable)
Having multiple lenses that have corresponding focal points in the same plane.
Source: Wiktionary
Par*fo"cal, a. [Pari- + focal.] (Opt.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition
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25 November 2024
ONCHOCERCIASIS
(noun) infestation with slender threadlike roundworms (filaria) deposited under the skin by the bite of black fleas; when the eyes are involved it can result in blindness; common in Africa and tropical America
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