noun
hypanthium
Botanical term for the cup-shaped structure formed by the fusion of the lower parts of the sepals, petals, and stamens, as in roses.
バラ科の植物では、隠頭花序が花の基部を取り巻いている。
In plants of the rose family, the hypanthium surrounds the base of the flower.
The term is composed of 隠頭 (hidden head) and 花序 (inflorescence), but the exact derivation is uncertain; it is a technical botanical term.