noun
water caltrop; water chestnut; caltrop
Refers to the aquatic plant Trapa natans or its edible nut. Often used in botanical or culinary contexts.
オニビシは池や沼に生える水草です。
The water caltrop is an aquatic plant that grows in ponds and marshes.
秋になると、オニビシの実を収穫します。
In autumn, we harvest water caltrop nuts.
菱 is a broader term for water caltrop or diamond shape, while オニビシ specifically refers to Trapa natans.
The name オニビシ literally means 'demon water caltrop', likely referring to the plant's spiky, horned nuts. The exact origin is uncertain.