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leaf  (lf)
n. pl. leaves (lvz)
1. A usually green, flattened, lateral structure attached to a stem and functioning as a principal organ of photosynthesis and transpiration in most plants.
2. A leaflike organ or structure.
a. Leaves considered as a group; foliage.
b. The state or time of having or showing leaves: trees in full leaf.
4. The leaves of a plant used or processed for a specific purpose: large supplies of tobacco leaf.
5. Any of the sheets of paper bound in a book, each side of which constitutes a page.
a. A very thin sheet of material, especially metal.
b. Such leaves considered as a group: covered in gold leaf.
7. A hinged or removable section for a table top.
8. A hinged or otherwise movable section of a folding door, shutter, or gate.
9. One of several metal strips forming a leaf spring.
v. leafed, leaf·ing, leafs
1. To produce leaves; put forth foliage: trees just beginning to leaf.
2. To turn pages, as in searching or browsing: leafed through the catalog.
To turn through the pages of.

[Middle English, from Old English laf.]

leaf [liːf]
n pl leaves [liːvz]
1. (Life Sciences & Allied Applications / Botany) the 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 Related adjs foliar, foliate
2. (Life Sciences & Allied Applications / Botany) foliage collectively
(Life Sciences & Allied Applications / Botany)
in leaf (of shrubs, trees, etc.) having a full complement of foliage leaves
4. (Communication Arts / Printing, Lithography & Bookbinding) one of the sheets of paper in a book
5. (Fine Arts & Visual Arts / Furniture) a hinged, sliding, or detachable part, such as an extension to a table
6. (Engineering / Metallurgy) metal in the form of a very thin flexible sheet gold leaf
7. (Engineering / Metallurgy) a foil or thin strip of metal in a composite material; lamina
8. (Engineering / General Engineering) short for leaf spring
9. (Miscellaneous Technologies / Building) the inner or outer wall of a cavity wall
10. (Life Sciences & Allied Applications / Agriculture) a crop that is harvested in the form of leaves
11. (Engineering / General Engineering) a metal strip forming one of the laminations in a leaf spring
12. (Life Sciences & Allied Applications / Plants) a slang word for marijuana
take a leaf out of (or from) someones book to imitate someone, esp in one particular course of action
turn over a new leaf to begin a new and improved course of behaviour
1. (when intr, usually foll by through) to turn (through pages, sheets, etc.) cursorily
2. (Life Sciences & Allied Applications / Botany) (intr) (of plants) to produce leaves
[Old English; related to Gothic laufs, Icelandic lauf]
leafless  adj
leaflessness  n
leaflike  adj

leaf  (lf)
An appendage growing from the stem of a plant. Leaves are extremely variable in form and function according to species. For example, the needles of pine trees, the spines of cacti, and the bright red parts of the poinsettia plant are all leaves modified for different purposes. However, most leaves are flat and green and adapted to capturing sunlight and carbon dioxide for photosynthesis. They consist of an outer tissue layer (the epidermis) through which water and gases are exchanged, a spongy inner layer of cells that contain chloroplasts, and veins that supply water and minerals and carry out food. Some leaves are simple, while others are compound, consisting of multiple leaflets. The flat part of the leaf, the blade, is often attached to the stem by a leafstalk.
renderings of monocotyledon (left) and eudicotyledon leaves

leaf  /lif/  n. leaves /livz/ 1 [C] a part of a plant, usu. flat and green, growing from its stem or a branch 2 [C] a sheet of paper with both sides used: The front leaf in the book has the title and author on one side and the copyright notice on the back side. 3 [U] a thin sheet of metal, such as gold: The frame of the mirror is covered with richlooking gold leaf. 4 in full leaf: fully grown, with complete foliage: In midsummer, trees are in full leaf. See: turn, 21.
v. phrasal v. insep. [T] to leaf through s.t.: to turn the pages of: He leafs through books before he buys them. leaf

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