We found one dictionary that defines the word fourth cousins:

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1. fourth cousins: Wiktionary

▸ Words similar to fourth cousins ▸ Usage examples for fourth cousins ▸ Idioms related to fourth cousins ▸ Wikipedia articles (New!) ▸ Words that often appear near fourth cousins ▸ Rhymes of fourth cousins ▸ Invented words related to fourth cousins