An area thinly wooded with oak trees; specifically (frequently in plural) a tract of land characterized by open stands of oak trees occurring naturally in prairie country, especially in the upper Mississippi valley.
Origin
Mid 19th century.
Definition of oak opening in US English:
oak opening
noun
US
An area thinly wooded with oak trees; specifically (frequently in plural) a tract of land characterized by open stands of oak trees occurring naturally in prairie country, especially in the upper Mississippi valley.