Pronunciation: ˌ pär- ' f ō -k ə l
Function: adjective
Etymology: Latin par equal + English focal
Date: circa 1886
: being or having lenses or lens sets (as eyepieces) with the corresponding focal points all in the same plane
– par · fo · cal · i · ty \ ˌ pär-f ō - ' ka-l ə -t ē \ noun
– par · fo · cal · ize \ ˌ pär- ' f ō -k ə - ˌ l ī z \ transitive verb