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mesophyll

noun [U]
 
 
/ˈmes.əʊ.fɪl/ US  /ˈmez.oʊ-/ specialized

Definition

the part of a leaf between the two thin surface layers, containing the cells responsible for photosynthesisParts of plants
(Definition of mesophyll noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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