Leaf - ορισμός. Τι είναι το Leaf
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Τι (ποιος) είναι Leaf - ορισμός

MAIN ORGAN OF PHOTOSYNTHESIS AND TRANSPIRATION IN HIGHER PLANTS, USUALLY CONSISTING OF A FLAT GREEN BLADE ATTACHED TO THE STEM DIRECTLY OR BY A STALK
Foliage; Mesophyll; Leaves (botany); Mesophyll cell; Plant leaves; Foilage; Compound leaf; Compound leaves; Leaves; Axil; Leaf margin; Axils; Mesophyll tissue; True leaves; Spongy layer; Leaf sheath; Complex leaf; Complex leaves; Megaphylls; Reticulate venation; Crenate; Venatious; Leafage; Foliages; Leaf anatomy; Leaf vein; Basal leaf; Vein in Plants; Veinlets; Foliar; Leaf axil; Simple leaf; Simple leaves; Alternate leaf; Leaf (botany); Parallel venation; Leaf axils; Opposite leaf; Big-leafed; Vein (botany); Leaf veins; Leaf margins; Lepidote; Elepidote; Elepidotes; Simple (botany); Alternate (botany); Opposite (botany); Clasping; Alternate (leaf); Opposite (leaf); Simple (leaf); Hysteranthy; Reticulate veined; Reticular venation; Palmately compound; Mucronulate; Venation (botany); Leaf venation; Stipel; Leaf blade; Lamina (leaf); Vein patterning; Parallel-veined leaf; Vein (leaf); Glabrous leaves; Sinuated; Sinuate; Cauline; Feather-veined; Palmately veined; Sericeous; Basal leaves; Serrated leaves; Margin (botany); Lanose; Dichotomous venation; Leaf venations; Isobilateral; Apex (leaf); Serrate leaf; Reticulate leaf; Leaf apex; Leaf tip; Spongy mesophyll layer; Spongy mesophyll; Cauline leaf; Cauline leaves
  • 3D rendering of a [[computed tomography]] scan of a leaf
  • Palmate venation, ''[[Acer truncatum]]''
  • Flabellate venation, ''[[Adiantum cunninghamii]]''
  • The veins of a [[bramble]] leaf
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  • Scanning electron microscope image of trichomes on the lower surface of a ''Coleus blumei'' ([[coleus]]) leaf
  • Crossyne guttata]]''
  • Rachis}}
  • A leaf shed in [[autumn]]
  • Near the ground these ''[[Eucalyptus]]'' saplings have juvenile dorsiventral foliage from the previous year, but this season their newly sprouting foliage is isobilateral, like the mature foliage on the adult trees above
  • New [[pomegranate]] leaves
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  • [[Poinsettia]] [[bract]]s are leaves which have evolved red pigmentation in order to attract insects and birds to the central flowers, an adaptive function normally served by [[petal]]s (which are themselves leaves highly modified by evolution).
  • Some [[insect]]s, like ''[[Kallima inachus]]'', mimic leaves.
  •  Stem
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  • A leaf with laminar structure and [[pinnate]] venation
  • [[Micrograph]] of a leaf skeleton
  • Medium-scale diagram of leaf internal anatomy
  • Fine-scale diagram of leaf structure
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  • SEM]] image of the leaf epidermis of ''[[Nicotiana alata]]'', showing [[trichome]]s (hair-like appendages) and [[stoma]]ta (eye-shaped slits, visible at full resolution).
  • Leaf morphology terms
  • Leaves showing various morphologies (clockwise from upper left): tripartite lobation, elliptic with serrulate margin, palmate venation, acuminate odd-pinnate (center), pinnatisect, lobed, elliptic with entire margin
  • Leaves shifting color in autumn (fall)
  • opposite]] one another, with successive pairs at right angles to each other (''decussate'') along the red stem. Note the developing buds in the axils of these leaves.
  • Whorled leaf pattern of the [[American tiger lily]]
  • Leaf of ''[[Tilia tomentosa]]'' (Silver lime tree)
  • Norfolk Island Pine]].
  • Venation of a Poinsettia (Euphorbia pulcherrima) leaf.
  • The overgrown petioles of [[rhubarb]] (''Rheum rhabarbarum'') are edible.
  • alt=Leafstem of dog rose with petiole, stipules and leaflets
  • The leaves on this plant (''[[Senecio angulatus]]'') are alternately arranged.
  • Common mullein (''[[Verbascum thapsus]]'') leaves are covered in dense, stellate trichomes.
  • Silky aster (''[[Symphyotrichum sericeum]]'') leaves are sericeous.
  • Branching veins on underside of [[taro]] leaf
  • linden]]
  • Animation of zooming into the leaf of a [[Sequoia sempervirens]] (Californian Redwood).
  • Vein skeleton of a leaf. Veins contain [[lignin]] that make them harder to degrade for microorganisms.

leaf         
¦ noun (plural leaves)
1. a flattened structure of a plant, typically green and blade-like, in which photosynthesis and transpiration mainly take place.
(often in phr. in/into leaf) the state of having leaves.
2. a single thickness of paper, especially in a book.
3. gold, silver, or other metal in the form of very thin foil.
4. the part of a door, shutter, or table that is hinged or may be inserted.
¦ verb
1. (of a plant) put out new leaves.
2. (leaf through) turn over (pages or papers), reading them quickly or casually.
Phrases
turn over a new leaf start to act or behave in a better way.
Derivatives
leafage noun
-leafed adjective
leafless adjective
leaf-like adjective
Origin
OE leaf, of Gmc origin.
leaf         
I
n.
1) a fig leaf (also fig.)
2) a bay; tea leaf
3) gold leaf
4) autumn; deciduous leaves
5) leaves fall; rustle; turn (the leaves were turning yellow)
6) (misc.) to turn over a new leaf ('to make a fresh start'); to take a leaf from smb.'s book ('to follow smb.'s example')
II
v. (d; intr.) to leaf through ('to look through superficially') (to leaf through a book)
LEAF         
<language> 1. LISP Extended Algebraic Facility. 2. "LEAF: A Language which Integrates Logic, Equations and Functions", R. Barbuti et al in Logic Programming, Functions Relations and Equations, D. DeGroot et al eds, P-H 1986, pp.201-238.

Βικιπαίδεια

Leaf

A leaf is a principal appendage of the stem of a vascular plant, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, flower, and fruit collectively form the shoot system. In most leaves, the primary photosynthetic tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of Eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves are flattened and have distinct upper (adaxial) and lower (abaxial) surfaces that differ in color, hairiness, the number of stomata (pores that intake and output gases), the amount and structure of epicuticular wax and other features. Leaves are mostly green in color due to the presence of a compound called chlorophyll that is essential for photosynthesis as it absorbs light energy from the sun. A leaf with lighter-colored or white patches or edges is called a variegated leaf.

Leaves can have many different shapes, sizes, textures and colors. The broad, flat leaves with complex venation of flowering plants are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants, which also includes acrogymnosperms and ferns. In the lycopods, with different evolutionary origins, the leaves are simple (with only a single vein) and are known as microphylls. Some leaves, such as bulb scales, are not above ground. In many aquatic species, the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines. Furthermore, several kinds of leaf-like structures found in vascular plants are not totally homologous with them. Examples include flattened plant stems called phylloclades and cladodes, and flattened leaf stems called phyllodes which differ from leaves both in their structure and origin. Some structures of non-vascular plants look and function much like leaves. Examples include the phyllids of mosses and liverworts.

Παραδείγματα από το σώμα κειμένου για Leaf
1. A Yellow Leaf Permission to reprint/republish A yellow leaf in the branches Of a shamel ash In the front yard; I see it, a yellow leaf Among so many.
2. Along with the legalization of the coca leaf, Morales said he also wants to industrialize the coca leaf so it can be made into food and medicinal products.
3. The recalled lettuce was packaged as Green Leaf 24 Count, waxed carton,‘‘ and Green Leaf 18 Count, cellophane sleeve, returnable carton.‘‘ Packaging is stamped with lot code 6SL0024.
4. He began with the brick wall, spending his first month covering it with gold leaf (leaf likes a smooth surface, so this task, Mr.
5. When an intruding fly trips trigger hairs inside the trap, movement of fluid within leaf cells builds up elastic strains in the leaf.