An‐tid″ro‐mous (ăn‐tĭd″rō̍‐mŭs), a. [Pref. anti- + Gr. δρόμοσ a running.] (Bot.) Changing the direction in the spiral sequence of leaves on a stem.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.