noun
offshore structure
Technical term for man-made structures built in the ocean, such as oil platforms, wind turbines, or artificial islands.
海洋構造物の設計には、波や風の影響を考慮する必要がある。
When designing offshore structures, it is necessary to consider the effects of waves and wind.
Compound of 海洋 (ocean) + 構造物 (structure). The exact historical derivation is uncertain, but the term is a straightforward modern technical compound.