波なみ消けしブロック

noun

wave-dissipating concrete block; tetrapod

A concrete block placed along coastlines to absorb wave energy and prevent erosion. Often called a tetrapod, though that is a specific brand name.

See also: 消波ブロック

• 海かい岸がんに波なみ消けしブロックが並ならんでいる。

  Wave-dissipating blocks are lined up along the shore.