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We found 16 dictionaries with English definitions that include the word focal ratio: Click on the first link on a line below to go directly to a page where "focal ratio" is defined. General (13 matching dictionaries) focal ratio: Collins English Dictionary [home, info] focal ratio: Vocabulary.com [home, info] focal ratio: Merriam-Webster's Online Dictionary, 11th Edition [home, info] focal ratio: Infoplease Dictionary [home, info] focal ratio: Dictionary.com [home, info] focal ratio: UltraLingua English Dictionary [home, info] Focal ratio: Wikipedia, the Free Encyclopedia [home, info] focal ratio: Rhymezone [home, info] focal ratio: Free Dictionary [home, info] focal ratio: Mnemonic Dictionary [home, info] focal ratio: WordNet 1.7 Vocabulary Helper [home, info] focal ratio: LookWAYup Translating Dictionary/Thesaurus [home, info] focal ratio: Dictionary/thesaurus [home, info] Computing (1 matching dictionary) focal ratio: Encyclopedia [home, info] Medicine (1 matching dictionary) focal ratio: Medical dictionary [home, info] Science (1 matching dictionary) Focal Ratio: Extragalactic Astronomy [home, info]

Quick definitions from WordNet (focal ratio) ▸ noun:  the ratio of the focal length to the diameter of a (camera) lens system