We found one dictionary that defines the word maternal uncles:

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1. maternal uncles: Wiktionary

Opposite: paternal aunts, avuncular, father's sisters ▸ Words similar to maternal uncles ▸ Usage examples for maternal uncles ▸ Idioms related to maternal uncles ▸ Wikipedia articles (New!) ▸ Words that often appear near maternal uncles ▸ Rhymes of maternal uncles ▸ Invented words related to maternal uncles