High-density

The high-density urban coastal corridor from Washington, DC, north to Boston is one of the most developed environments in the world, containing a massive, complex, and long-standing network of supporting infrastructure. The Northeast also has a vital rural component.

Source: tatoeba (3651095)

MDF and HDF – or medium-density fiberboard and high-density fiberboard – are two of the trendiest materials in woodworking these days.

Source: wiktionary