noun
wave-dissipating concrete block; tetrapod
Concrete armor unit used on coastlines and breakwaters to reduce wave energy. Often called tetrapod, though that is a specific brand name.
海岸に消波ブロックが並んでいる。
Wave-dissipating blocks are lined up along the coast.
この港の防波堤には消波
Tetrapods are used on the breakwater of this port.