Definition of duck mussel in English:

duck mussel

Syllabification: duck mus·sel

noun

A freshwater bivalve mollusk that is smaller and darker than the related swan mussel, found in rivers with sandy or gravelly bottoms.
  • Anodonta anatina, family Unionidae

Definition of duck mussel in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal