Definition of mesophyll noun from the Oxford Advanced Learner's Dictionary

 

mesophyll

 noun
noun
BrE BrE//ˈmezəfɪl//
 
; NAmE NAmE//ˈmezəfɪl//
 
; BrE BrE//ˈmiːzəfɪl//
 
; NAmE NAmE//ˈmiːzəfɪl//
 
; BrE also BrE//ˈmesəfɪl//
 
, also BrE//ˈmiːsəfɪl//
 
[uncountable](biology)
 
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the material that the inside of a leaf is made of Word Origin mid 19th cent.: from meso- ‘middle’ + Greek phullon ‘leaf’.
See the Oxford Advanced American Dictionary entry: mesophyll