PHOTOPERIOD


Meaning of PHOTOPERIOD in English

— photoperiodic /foh'teuh pear'ee od"ik/ , photoperiodical , adj. — photoperiodically , adv.

/foh'teuh pear"ee euhd/ , n. Biol.

the interval in a 24-hour period during which a plant or animal is exposed to light.

[ 1915-20; PHOTO- + PERIOD ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .