Definition of "unio" [u•ni•o]

• Any of the genus Unio of freshwater mussels. (noun)

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• "The pearl (margarita) in Arab. is Lu'lu '; the "unio" or large pearl Durr, plur."
• "Note 125: Platina states, however, that unio refers to "unique" because "nowhere are two found like.""
• "The boilerplate language of an interest card ALWAYS designates the unio"