Pronunciation: (ōk), [key]
1. any tree or shrub belonging to the genus Quercus, of the beech family, bearing the acorn as fruit.
2. the hard, durable wood of such a tree, used in making furniture and in construction.
3. the leaves of this tree, esp. as worn in a chaplet.
4. anything made of the wood of this tree, as an item of furniture, a door, etc.
5. sport one's oak, Brit.(of a university student) to indicate that one is not at home to visitors by closing the outer door of one's lodgings.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.