The Vietnamese word "hải đăng" means lighthouse in English. A lighthouse is a tall structure, often near the coast, that has a bright light at the top. It helps guide ships safely to shore and warns them of dangerous areas like rocks or shallow waters.
In more advanced contexts, you might encounter discussions about the history of lighthouses, their engineering, or their role in maritime law. You could use "hải đăng" in sentences like: - "Hải đăng đã giúp các ngư dân tìm đường về nhà an toàn trong suốt nhiều thế kỷ."
(Lighthouses have helped fishermen find their way home safely for centuries.)