photoperiod

[ foh-tuh-peer-ee-uh d ]
/ ˌfoʊ təˈpɪər i əd /

noun Biology.

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

Origin of photoperiod

First recorded in 1915–20; photo- + period

OTHER WORDS FROM photoperiod

pho·to·pe·ri·od·ic [foh-tuh-peer-ee-od-ik] /ˌfoʊ təˌpɪər iˈɒd ɪk/, pho·to·pe·ri·od·i·cal, adjective pho·to·pe·ri·od·i·cal·ly, adverb

Example sentences from the Web for photoperiod

British Dictionary definitions for photoperiod

photoperiod
/ (ˌfəʊtəʊˈpɪərɪəd) /

noun

the period of daylight in every 24 hours, esp in relation to its effects on plants and animals See also photoperiodism

Derived forms of photoperiod

photoperiodic, adjective photoperiodically, adverb

Medical definitions for photoperiod

photoperiod
[ fō′tō-pîrē-əd ]

n.

The duration of an organism's daily exposure to light, considered especially with regard to the effect of such exposure on growth and development.

Other words from photoperiod

pho′to•pe′ri•odic (-ŏdĭk) null adj.

Scientific definitions for photoperiod

photoperiod
[ fō′tō-pîrē-əd ]

The duration of an organism's daily exposure to light, considered especially with regard to the phenomena of photoperiodism.