A tree of the species Quercus stellata (family Fagaceae), native to North America.

The weed Dysphania botrys, native to the Mediterranean region and naturalized in North America. / The herb epazote, Dysphania ambrosioides, native to the Americas.

Quercus marilandica.

Quercus macrocarpa.

(usually countable) A deciduous oak tree, Quercus velutina, native to eastern North America.

Quercus cerris, native to Asia Minor and southeastern Europe.

(botany) A disease of unknown cause that affects oaks in the United Kingdom.

Thaumetopoea processionea, a processionary native to oak forests across southern Europe, also occurring as an invasive species in northern Europe.

(Australia) Any of various trees and shrubs of the family Casuarinaceae growing in Australasia and parts of Asia. / (Australia slang, now rare) Beer.

oakum made from untarred rope