noun
potato bean; groundnut; hopniss
Refers to the plant Apios americana, a North American legume with edible tubers. Known by many English common names; the most widely used are potato bean, groundnut, and hopniss.
アメリカホドイモは北米原産のマメ科植物で、地下に食用の塊茎をつける。
The potato bean is a leguminous plant native to North America that produces edible tubers underground.
From アメリカ (America) + ホドイモ (potato bean, from 塊芋, literally 'lump potato'). The Japanese name directly reflects the plant's origin and its tuberous nature.