\ ˈlȯŋ-ˈdā
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Definition of long-day
: responding to or relating to a long photoperiod
—used especially of a plant
— compare day-neutral, short-day
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“Long-day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/long-day. Accessed 5 Mar. 2021.
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The first known use of long-day was in 1920
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