Dictionary  pal'isade' paren'chymaBot. the upper layer of ground tissue in a leaf, consisting of elongated cells beneath and perpendicular to the upper epidermis and constituting the primary area of photosynthesis. Also called palisade, pal'isade mes'ophyll. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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