phototonus
[ foh-tot-n-uhs ]
nounBiology.
the normal condition of sensitiveness to light in organisms or their organs.
the irritability exhibited by cytoplasm when exposed to light of a certain intensity.
Origin of phototonus
1Other words from phototonus
- pho·to·ton·ic [foh-tuh-ton-ik], /ˌfoʊ təˈtɒn ɪk/, adjective
Words Nearby phototonus
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British Dictionary definitions for phototonus
phototonus
/ (fəʊˈtɒtənəs) /
noun
the condition of plants that enables them to respond to the stimulus of light
Origin of phototonus
1C19: from photo- + Greek tonos tone
Derived forms of phototonus
- phototonic (ˌfəʊtəʊˈtɒnɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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