Relating to or belonging to the Fagaceae family of plants.
From Fagaceae (the plant family) with the adjectival suffix '-ous.' Follows standard botanical nomenclature patterns.
When botanists add '-aceous' to plant family names, they're using a Latin convention that's been standard for 300 years—it's why you hear 'rosaceous,' 'solanaceous,' and 'fabaceous' in botanical discussions.
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