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We found 18 dictionaries with English definitions that include the word photoperiod: Click on the first link on a line below to go directly to a page where "photoperiod" is defined. General (10 matching dictionaries) photoperiod: American Heritage Dictionary of the English Language [home, info] photoperiod: Collins English Dictionary [home, info] photoperiod: Merriam-Webster's Online Dictionary, 11th Edition [home, info] photoperiod: Wordnik [home, info] photoperiod: Wiktionary [home, info] photoperiod: Webster's New World College Dictionary, 4th Ed. [home, info] photoperiod: Infoplease Dictionary [home, info] photoperiod: Dictionary.com [home, info] Photoperiod: Wikipedia, the Free Encyclopedia [home, info] photoperiod: Dictionary/thesaurus [home, info] Computing (1 matching dictionary) photoperiod: Encyclopedia [home, info] Medicine (4 matching dictionaries) Photoperiod: Medical Dictionary [home, info] photoperiod: online medical dictionary [home, info] Photoperiod: Sleep Terms [home, info] photoperiod: Medical dictionary [home, info] Science (1 matching dictionary) photoperiod: Botanical Terms [home, info] Tech (2 matching dictionaries) Photoperiod: Dairy Glossary [home, info] photoperiod: Glossary of Meteorology [home, info]