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urstromtal noun

  /ˈʊəstɹəʊmˌtɑːl/ , /ˈʊəstɹəʊmˌtɛlə/ , /ˈʊɹstɹoʊmˌtɑl/ , /ˈʊɹstɹoʊmˌtɛləɹ/
  • (geology) A broad glacial valley formed during an ice age by meltwater flowing roughly parallel to the ice margin.
 vallis proglacialis
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