parfocal

adjective

par·​fo·​cal ˌpär-ˈfō-kəl 

: being or having lenses or lens sets (such as eyepieces) with the corresponding focal points all in the same plane

parfocality

ˌpär-fō-ˈka-lə-tē 

noun

parfocalize

ˌpär-ˈfō-kə-ˌlīz 

transitive verb

Word History

Etymology

Latin par equal + English focal

First Known Use

circa 1886, in the meaning defined above

Medical Definition

parfocal

adjective

par·​fo·​cal (ˈ)pär-ˈfō-kəl 

: 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

parfocality

-fō-ˈkal-ət-ē 

noun

plural parfocalities