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phototonus
[ foh-tot-n-uhs ]
/ foʊˈtɒt n əs /
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noun Biology.
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.
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OTHER WORDS FROM phototonus
pho·to·ton·ic [foh-tuh-ton-ik], /ˌfoʊ təˈtɒn ɪk/, adjectiveWords nearby phototonus
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
British Dictionary definitions for phototonus
phototonus
/ (fəʊˈtɒtənəs) /
noun
the condition of plants that enables them to respond to the stimulus of light
Derived forms of phototonus
phototonic (ˌfəʊtəʊˈtɒnɪk), adjectiveWord Origin for phototonus
C19: from photo- + Greek tonos tone
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
Medical definitions for phototonus
phototonus
[ fō-tŏt′n-əs ]
n.
The state of being sensitive to or irritated by light.
Other words from phototonus
pho′to•ton′ic (fō′tə-tŏn′ĭk) adj.The American Heritage® Stedman's Medical Dictionary
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