oak that has been exposed to ammonia fumes to darken its color.

Used in the names of various plants the leaves of which resemble those of the oak.

(uncountable) A flexible material akin to thick paper. / (countable) A rectangular sheet of this material. / (uncountable) Poster board.

(uncountable) A flexible material akin to thick paper. / (countable) A rectangular sheet of this material.

An oak, Quercus coccifera, native to the western Mediterranean region and growing 1-6 meters tall.

A species of oak tree native to the eastern USA (Quercus montana, syn. Quercus prinus).

A type of evergreen oak tree, Quercus suber, native to southwest Europe and northwest Africa.

Quercus emoryi, an oak common in Arizona, New Mexico, and western Texas, typically growing in dry hills at moderate altitudes and retaining its leaves through the winter.

In California: / in the southwestern United States: / In the northeastern United States: / in the southeastern United States / In Europe

(chiefly Canada, US) Any of various hard oaks that grow near rivers or swamps, especially Quercus nigra, of the southern US.