photocycle
/ˈfəʊtəʊˌsʌɪkl/Biology and Biochemistry
noun
1A chemical, physiological, or ecological cycle induced by changes in light levels; especially a photoperiodic cycle in plants; a sequence of structural changes that some molecules undergo in response to light.
2A cycle of light and darkness (whether natural or produced experimentally).
Origin
1950s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America. From photo- + cycle.
- the lights are on, but nobody's (or no one's)home
- the likes of
- the Line
- the line of least resistance
- the line (or path) of least resistance
- the lion's den
- the lion's share
- the Litany
- the little woman
- the Liturgy
- the living image of
- the long and the short of it
- the long (or strong) arm of the law
- the long/short/medium term
- Thelon River
- the Lords
- the Lord's Day
- the Lord's Prayer
- the Lord's Supper
- (the love of) money is the root of all evil
- the love that dare not speak its name
- the Lower House
- the lowest of the low
- the Lowlands
- the luck of the draw