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

 

chlorophyll

 noun
noun
BrE BrE//ˈklɒrəfɪl//
 
; NAmE NAmE//ˈklɔːrəfɪl//
 
[uncountable] Cell biology
 
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the green substance in plants that absorbs light from the sun to help them grow see also photosynthesis See related entries: Cell biology Word Origin early 19th cent.: coined in French from Greek khlōros ‘green’ + phullon ‘leaf’.
See the Oxford Advanced American Dictionary entry: chlorophyll