noun
or butterfly mussel
: a freshwater mussel ( Plagiola securis ) found in the Ohio and Illinois rivers and reported to produce pearls of fine quality
noun
or butterfly mussel
: a freshwater mussel ( Plagiola securis ) found in the Ohio and Illinois rivers and reported to produce pearls of fine quality
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012