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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Pho·tot·o·nus n.
 1. Bot. A motile condition in plants resulting from exposure to light. -- Pho*to*ton*ic a.
 2. Physiol. An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light. -- Pho*to*ton*ic a.
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