A deciduous tree with distinctive deeply lobed leaves, acorns, and notably strong wood, typically of England and northeastern North America, included in genus Quercus.

The wood of the oak.

A rich brown colour, like that of oak wood.

Any tree of the genus Quercus, in family Fagaceae.

Any tree of other genera and species of trees resembling typical oaks of genus Quercus in some ways.

The outer (lockable) door of a set of rooms in a college or similar institution. (Often in the phrase "to sport one's oak").

The flavor of oak.

A stakes race in which entry is restricted to 3-year-old fillies.