water caltrop; water chestnut; caltrop
Refers to the aquatic plant Trapa natans or its edible nut. Often used in botanical or culinary contexts.
The water caltrop is an aquatic plant that grows in ponds and marshes.
In autumn, we harvest water caltrop nuts.
Katakana spelling is common for this plant name.
Kanji spelling is rare; the word is usually written in kana.
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.