‖Mes′o‐phlœ″um (?), n. [NL., fr. Gr. μέσοσ middle + φλοιόσ bark.] (Bot.) The middle bark of a tree; the green layer of bark, usually soon covered by the outer or corky layer, and obliterated.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.