Relating to or belonging to the Bignoniaceae family of plants.
From Bignoniaceae (the plant family name) plus the suffix '-ous' (Latin, meaning 'full of' or 'characterized by'), creating an adjective form describing plants of this family.
This technical adjective is a perfect example of how scientific language builds systematic precision—once you know that '-aceae' marks plant families and '-ous' makes adjectives, you can understand 'bignoniaceous' even if you've never heard it before.
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