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photomontage
photomosaic
photomultiplier
photon
photonegative
photonics
photonuclear
photoperiod
photoperiodism
photopheresis
photophilic
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photophore
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photoperiodism
pho·to·pe·ri·od·ism [ ftō pree ə dìzzəm ]


noun 
Definition:
 
influence of photoperiod on organism: the influence of the daily cycle of light and darkness on the physiology and behavior of an organism
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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