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Bible Dictionaries
Phototonus

Webster's Dictionary

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(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.

Bibliography Information
Webster, Noah. Entry for 'Phototonus'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/phototonus.html. 1828.
 
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