单词	Unionidae
释义	Unionidae plural noun Uni·​on·​i·​dae : a very large family of freshwater mussels (suborder Submytilacea) having a pearly often roughly sculptured shell with a thick epidermis and larvae that pass through a glochidium stage and being represented in nearly all parts of the world but chiefly in North America where the nacreous shells of many of them are used for button making Word History Etymology New Latin, from Union-, Unio, type genus + -idae
随便看	stupifyes stupifying stuping stupor stupor mundi stuporific stuporous stupors stupose stupp stuprate stuprated stuprates stuprating stupration stuprations stuprum stupulose sturdier sturdies sturdiest sturdilier sturdiliest sturdily sturdiness

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