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English definition of “leaf”

leaf

noun [C] (PLANT)    /liːf/ (plural leaves)
B1 one of the flat , usually green parts of a plant that are joined at one end to the stem or branch : a palm leaf autumn leaves He was sweeping up leaves in his garden .Parts of plants be in leaf/come into leaf When a plant is in leaf or when it comes into leaf, it has or gets leaves on it: The trees are in leaf early this year . The bushes are just coming into leaf.Parts of plants
(Definition of leaf noun (PLANT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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