We found 6 dictionaries that define the word oak apples:

General (5 matching dictionaries)

1. oak apples: Merriam-Webster
2. oak apples: Collins English Dictionary
3. oak apples: Vocabulary.com
4. oak apples: Wiktionary
5. oak apples: TheFreeDictionary.com

Computing (1 matching dictionary)

6. oak apples: Encyclopedia

(Note: See oak_apple as well.)

Definitions from Wiktionary (oak apple) ▸ noun:  A spherical type of oak gall, produced by an oak gall wasp (tribe Cynipini). ▸ Also see oak_apple ▸ Words similar to oak apples ▸ Usage examples for oak apples ▸ Idioms related to oak apples ▸ Wikipedia articles (New!) ▸ Words that often appear near oak apples ▸ Rhymes of oak apples ▸ Invented words related to oak apples