Definition of: oak

(ōk) noun
1. A hardwood, acorn–bearing tree or shrub (genus Quercus) of the beech family, valued for the hardness, strength, and durability of its timber. ♦ Collateral adjective: quercine.
2. The wood or timber of the oak.
3. One of various other plants having a resemblance or relation to the oak: Jerusalem oak.
4. A stout door: so called because usually made of oak.
5. Any of various shades of finished oak wood.
6. The leaves of the oak, as in a garland: used as a crown: in ancient Rome, the reward of a hero who saved the life of a fellow man.
7. Oaken woodwork or furniture.
—quartered oak Oaken boards cut by quarter–sawing, and exhibiting a striking grain.
—to sport one's oak To exclude visitors by closing the outer door of one's apartment: English university slang. [OE āc]