Definition of "sand-dune" [sand-dune]

• A ridge of loose sand drifted by the wind: same as dune. (noun)

The Century Dictionary (Public Domain)

• "The book is so full of helpful tips that some paragraphs will need a second read; otherwise, one could get lost trying to figure out east from west, follow sea currents and decipher sand-dune shapes."
• "The water stood, a great lake of it, bulging beyond a high sand-dune."
• "Policymakers faced with the degradation of coastal and marine environments, including the loss of coastal flats and sand-dune degradation, focus on reclamation of intertidal and sub-tidal mudflats and sandbanks and damage to coral reefs."