We found one dictionary that defines the word oak-leaf clusters:

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1. oak-leaf clusters, oak-leaf clusters: Collins English Dictionary

▸ Words similar to oak-leaf clusters ▸ Usage examples for oak-leaf clusters ▸ Idioms related to oak-leaf clusters ▸ Wikipedia articles (New!) ▸ Words that often appear near oak-leaf clusters ▸ Rhymes of oak-leaf clusters ▸ Invented words related to oak-leaf clusters