Having parts or members arranged in twos, or composed of two similar parts; in botany, having flower parts in multiples of two.
From 'dimer' (two parts) + '-ous' (full of, characterized by). The suffix '-ous' indicates a quality or characteristic, and this term is particularly common in botanical and zoological taxonomy.
Many flowers are dimerous or tetramerous (multiples of two or four), while others are trimerous (multiples of three), and this pattern runs so deep that you can sometimes identify plant families just by counting flower parts—it's evolution writing in mathematics.
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