Relating to, characteristic of, or formed by sand dunes; of or pertaining to dunes.
From 'dune' (a sand hill, from Dutch 'duin') + adjective-forming suffix '-al,' meaning 'relating to.' This is a standard geographical/geological term.
Dunal ecosystems are surprisingly complex—the plants that stabilize dunes have adapted to salt spray, shifting sand, and intense sun, making sand dunes more dynamic than they appear.
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