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Definition of leaf noun from the Oxford Advanced American Dictionary

      

    leaf

     noun
    noun
    NAmE//lif//
     
    (pl. leaves
    NAmE//livz//
     
    )
     
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  1. 1[countable] a flat green part of a plant, growing from a stem or branch or from the root lettuce/cabbage/oak leaves The trees are just coming into leaf. the dead leaves of autumn Topic CollocationsThe Living Worldanimals
    • animals mate/breed/reproduce/feed (on something)
    • fish/amphibians swim/spawn (= lay eggs)
    • birds fly/migrate/nest/sing
    • insects crawl/fly/bite/sting
    • insects/bees/locusts swarm
    • bees collect/gather nectar/pollen
    • spiders spin/weave a web
    • snakes/lizards shed their skins
    • bears/hedgehogs/frogs hibernate
    • insect larvae grow/develop/pupate
    • an egg/a chick/a larva hatches
    • attract/find/choose a mate
    • produce/release eggs/sperm
    • lay/fertilize/incubate/hatch eggs
    • inhabit a forest/a reef/the coast
    • mark/enter/defend (a) territory
    • stalk/hunt/capture/catch/kill prey
    plants and fungi
    • trees/plants grow/bloom/blossom/flower
    • a seed germinates/sprouts
    • leaves/buds/roots/shoots appear/develop/form
    • flower buds swell/open
    • a fungus grows/spreads/colonizes something
    • pollinate/fertilize a flower/plant
    • produce/release/spread/disperse pollen/seeds/spores
    • produce/bear fruit
    • develop/grow/form roots/shoots/leaves
    • provide/supply/absorb/extract/release nutrients
    • perform/increase/reduce photosynthesis
    bacteria and viruses
    • bacteria/microbes/viruses grow/spread/multiply
    • bacteria/microbes live/thrive in/on something
    • bacteria/microbes/viruses evolve/colonize something/cause disease
    • bacteria break something down/convert something (into something)
    • a virus enters/invades something/the body
    • a virus mutates/evolves/replicates (itself)
    • be infected with/contaminated with/exposed to a new strain of a virus/drug-resistant bacteria
    • contain/carry/harbor bacteria/a virus
    • kill/destroy/eliminate harmful/deadly bacteria
    see bay leaf, fig leaf
  2. 2-leaf, -leafed, -leaved (in adjectives) having leaves of the type or number mentioned a four-leaf clover a broad-leaved plant
  3. 3[countable] a sheet of paper, especially a page in a book She carefully turned the leaves of the precious volume. see flyleaf, loose-leaf, overleaf
  4. 4[uncountable] metal, especially gold or silver, in the form of very thin sheets gold leaf
  5. 5[countable] a part of a table that can be lifted up or pulled into position in order to make the table bigger
  6. Idioms
    take a page/leaf from/out of somebody's book
     
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    to copy someone's behavior and do things in the same way that they do, because they are successful synonym emulate
    turn over a new leaf
     
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    to change your way of life, to become a better, more responsible person
See leaf in the Oxford Advanced Learner's Dictionary