口こう径けい比ひMeaningsNoun1. aperture ratio (inverse of the f-number); relative apertureKanji used口mouth径diameter比compare (things of the same type)Pitch accentこうけいひComposed of口こう径けいaperture; bore; calibre; caliberNoun比ひratio; proportion; match; equal; equivalent; comparison; compared with ...; relative to ...; Philippines; explicit comparison (style of the Shi Jing)Noun