Meaning of “leaf” - Learner’s Dictionary

leaf

noun [ C ] us uk /liːf/ plural leaves /liːvz/
a maple leafautumn leavesA lot of trees shed their leaves in the autumn.You can recognize trees by the shape of their leaves.By winter, all the leaves had fallen off the trees.

B1 a flat, green part of a plant that grows from a stem or branch:

an oak leaf
a lettuce leaf
the falling leaves

(Definition of “leaf” from the Cambridge Learner’s Dictionary © Cambridge University Press)