Bible Dictionaries
Phototonus
Webster's Dictionary
(1):
(n.) A motile condition in plants resulting from exposure to light.
(2):
(n.) An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light.
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Bibliography Information
Webster, Noah. Entry for 'Phototonus'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/phototonus.html. 1828.