Medical Definition of parfocal
: 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
Learn More about parfocal
Dictionary: Definition of "parfocal"
Seen and Heard
What made you want to look up parfocal? Please tell us where you read or heard it (including the quote, if possible).