also: うみすな
noun
sea sand; ocean sand; beach sand
Refers to sand from the sea or ocean, often used in contexts like construction, gardening, or describing beach sand.
この海砂はコンクリートに使われる。
This sea sand is used for concrete.
海岸で海砂を集めた。
I collected sea sand at the beach.
Compound of 海 (umi, 'sea') and 砂 (suna, 'sand'). The reading うみずな is a common rendaku form.