Definitions:
a flattened structure of a higher plant, typically green and blade-like, that is attached to a stem directly or via a stalk. leaves are the main organs of photosynthesis and transpiration

a thing that resembles a leaf in being flat and thin.

(of a plant, especially a deciduous one in spring) put out new leaves

turn over (the pages of a book or the papers in a pile), reading them quickly or casually