Pho′to‐dy‐nam″ics (?), n. [Photo- + dynamics.] (Plant Physiol.) The relation of light to the movements of plants and their organs; the study of the phenomena of curvatures induced by the stimulus of light. — Pho′to‐dy‐nam″ic (#), Pho′to‐dy‐nam″ic‐al (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.