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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. 2023
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
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