long-day

[ lawng-dey, long- ]

adjective

, Botany.

1. requiring a long photoperiod in order to flower.

long-day

adjective

1. See short-day
   (of certain plants) able to mature and flower only if exposed to long periods of daylight (more than 12 hours), each followed by a shorter period of darkness Compare short-day

Word History and Origins

Origin of long-day¹

First recorded in 1915–20

Example Sentences

Mrs. Armine was fatigued by the journey, and by the long day at Denderah, which had secretly depressed her.

From Project Gutenberg

Then tears would cloud the beautiful black eyes, and the labours of the long day fell more heavily from the willing hands.

From Project Gutenberg

I'd rather get up even earlier than usual on a holiday, and feel we have the whole long day before us.

From Project Gutenberg

It was told afterward by the Shawnees that he killed more than that weak-hearted one during the long day.

From Project Gutenberg

The next day the gentlemen went fishing and Marion and Judith kept the long day to themselves.

From Project Gutenberg