[mez-uh-fil, mes-, mee-zuh-, -suh-]
noun Botany.
the parenchyma, usually containing chlorophyll, that forms the interior parts of a leaf.

1830–40; meso- + -phyll

mesophyllic, mesophyllous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mesophyll (ˈmɛsəʊˌfɪl)
the soft chlorophyll-containing tissue of a leaf between the upper and lower layers of epidermis: involved in photosynthesis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
mesophyll   (měz'ə-fĭl')  Pronunciation Key 
The tissues of a leaf that are located in between the layers of epidermis and carry on photosynthesis, consisting of the palisade layer and the spongy parenchyma. Most mesophyll cells contain chloroplasts.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for mesophyll
They mainly occur in cortex epidermis, pith and mesophyll of leaves.
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