Definition of Photoperiod

1. [n -S]

Medical Definition of Photoperiod

1. Recurring cycle of light and dark periods. The natural photoperiod is approximately 24 hours, and the ratio of light to dark hours slowly changes over the course of a year. In controlled experiments, the photoperiod is usually (but not necessarily) retained at 24 hours, and the light:dark ratio is typically constant. (09 Oct 1997)

Lexicographical Neighbors of Photoperiod

photons
photonuclear
photon density
photooxidase
photooxidation
photooxidations
photooxidative
photooxidize
photooxidized
photooxidizes
photooxidizing
photopathy
photopeak
photoperceptive
photoperiod (current term)
photoperiod (current term)
photoperiodic
photoperiodism
photoperiodism
photoperiodisms
photoperiods
photophase
photophases
photopheresis
photophobia
photophobia
photophobias
photophobic
photophobic
photophone

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