† pachystichousadj.BotanyObsoleterare (of a cell) having thick walls ( N.E.D. (1904) gives the pronunciation as (păki·stikəs) /pəˈkɪstɪkəs/).Apparently only attested in dictionaries or glossaries.
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1866 J. Lindley & T. MooreTreasury Bot. II. 834/2Pachystichous, thick-sided; applied to cells only.