long-day

adjective
\ ˈlȯŋ-ˈdā How to pronounce long-day (audio) \

Definition of long-day

: responding to or relating to a long photoperiod used especially of a plant — compare day-neutral, short-day

First Known Use of long-day

1920, in the meaning defined above

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The first known use of long-day was in 1920

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