leaf 
(lēf)
(lēf)n. pl. leaves (lēvz)
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.
3.
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.
6.
a. A very thin sheet of material, especially metal.
b. Such leaves considered as a group: covered in gold leaf.
7.
a. A hinged or removable section for a table top.
b. A hinged or otherwise movable section of a folding door, shutter, or gate.
c. A section of drawbridge that moves upward or to the side.
8. One of several metal strips forming a leaf spring.
v.leafed, leaf·ing, leafs
v.intr.
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.
v. tr.
Phrasal Verb: To turn through the pages of.
leaf out
Idioms: To put forth leaves, especially after a period of dormancy: the period in the spring when trees begin to leaf out.
take a leaf from (someone)
To use (someone) as an example.
take a leaf from (or out of) (someone's) book
To use (someone) as an example.
[Middle English, from Old English lēaf.]
leaftop: anatomy of a leaf
bottom: a double-leaf bascule drawbridge