1a 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:many of the trees had lost their leavesbay leavesan oak leaf
any of a number of plant structures similar to leaves, e.g. bracts, sepals, and petals.
[mass noun] foliage regarded collectively.
[mass noun] the state of having leaves:the trees are still in leaf
[mass noun] the leaves of tobacco or tea: [as modifier]:leaf tea
2a thing that resembles a leaf in being flat and thin.
a single thickness of paper, especially in a book with each side forming a page.
[mass noun, with modifier] gold, silver, or other specified metal in the form of very thin foil:gold leaf
the hinged part or flap of a door, shutter, or table.
an extra section inserted to extend a table.
the inner or outer part of a cavity wall or double-glazed window.
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Universal
1(of a plant, especially a deciduous one in spring) put out new leaves:many plants need a period of dormancy before they leaf and flower
2 (leaf through) turn over (the pages of a book or the papers in a pile), reading them quickly or casually:he leafed through the stack of notes
shake (or tremble) like a leaf
(of a person) tremble greatly, especially from fear.