:10
:09
:08
:07
:06
:05
:04
:03
:02
:01
| profound change in form from one stage to the next in the life of an organism, as from the caterpillar to the pupa and then to the adult butterfly |
| the subdivision of an organism or of an organ into more or less equivalent parts; cell division |
| photoperiod (ˌfəʊtəʊˈpɪərɪəd) | |
| —n | |
| See also photoperiodism the period of daylight in every 24 hours, esp in relation to its effects on plants and animals | |
| photoperi'odic | |
| —adj | |
| photoperi'odically | |
| —adv | |
photoperiod pho·to·pe·ri·od (fō'tō-pĭr'ē-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.
| photoperiod (fō'tō-pîr'ē-əd) Pronunciation Key
The duration of an organism's daily exposure to light, considered especially with regard to the phenomena of photoperiodism. |