gamopetalous flower; sympetalous flower
Botanical term for a flower whose petals are fused together, at least at the base. Used in technical contexts.
Examples of gamopetalous flowers include morning glories and azaleas.
Compound of 合 (gō, 'together') + 弁 (ben, 'petal') + 花 (ka, 'flower'). A straightforward kanji compound describing the fused-petal structure.