[ lawng-dey, long- ]

  1. requiring a long photoperiod in order to flower.

Origin of long-day

First recorded in 1915–20

Words Nearby long-day

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use long-day in a sentence

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

    Bella Donna | Robert Hichens
  • Then tears would cloud the beautiful black eyes, and the labours of the long day fell more heavily from the willing hands.

    The World Before Them | Susanna Moodie
  • I'd rather get up even earlier than usual on a holiday, and feel we have the whole long day before us.

    Robin Redbreast | Mary Louisa Molesworth
  • It was told afterward by the Shawnees that he killed more than that weak-hearted one during the long day.

    A Virginia Scout | Hugh Pendexter
  • The next day the gentlemen went fishing and Marion and Judith kept the long day to themselves.

    Growing Up | Jennie M. Drinkwater

British Dictionary definitions for long-day


  1. (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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012