củ ấu
Definition
- Noun:
- Water caltrop: The edible fruit of an aquatic plant (Trapa spp.), characterized by its hard, dark, horned shell and starchy white interior. It is a common floating plant in ponds and slow-moving rivers in Southeast Asia.
- Water chestnut (in some contexts): While distinct from the Chinese water chestnut (Eleocharis dulcis), it is sometimes referred to by this name due to its similar aquatic habitat and starchy texture.
Usage Examples
- Noun:
- Củ ấu thường được luộc chín để ăn. (Water caltrops are often boiled to eat.)
- Trên mặt hồ phủ đầy lá và quả của cây củ ấu. (The lake's surface is covered with the leaves and fruits of the water caltrop plant.)
- Củ ấu có vị bùi và béo. (Water caltrops have a nutty and rich flavor.)
Advanced Usage
- Botanical Context: The term specifically refers to the fruit of plants in the genus , notably (horned nut) or . It is not a true root vegetable but a drupe.
Variants and Related Words
- Cây củ ấu (n): The water caltrop plant itself.
- Cây củ ấu sống ở ao hồ. (The water caltrop plant lives in ponds and lakes.)
Synonyms
- Water caltrop: The most precise English equivalent.
- Horn nut: Descriptive name referring to its shape.
- Bat nut: Another common name due to its resemblance to a bat's wings.
- Ling nut: Name used in some regions.
Related Cultural Context
- Street Food: In Vietnam, boiled or roasted water caltrops are a popular seasonal street snack, especially in autumn.
- Traditional Medicine: In some practices, it is believed to have cooling properties and is used in certain remedies.