We found 8 dictionaries that define the word oak trees:

General (5 matching dictionaries)

1. oak trees: Vocabulary.com
2. oak-trees: Wordnik
3. oak trees: Wiktionary
4. Oak trees: Wikipedia, the Free Encyclopedia
5. Oak trees: TheFreeDictionary.com

Computing (1 matching dictionary)

6. Oak trees: Encyclopedia

Medicine (1 matching dictionary)

7. Oak trees: Medical dictionary

Miscellaneous (1 matching dictionary)

8. Oak trees: Idioms

(Note: See oak_tree as well.)

Definitions from Wiktionary (oak tree) ▸ noun:  A tree of the genus Quercus, bearing acorns and having lobed leaves. ▸ Also see oak_tree ▸ Words similar to oak trees ▸ Usage examples for oak trees ▸ Idioms related to oak trees ▸ Wikipedia articles (New!) ▸ Words that often appear near oak trees ▸ Rhymes of oak trees ▸ Invented words related to oak trees