tardigrade
noun
                                                                                                                            
                                                            tar·di·grade
                    
                                                                                                              
                                                                                                                                  ˈtär-də-ˌgrād 
                                                      
                                                          
            
                                
              
          
                                                      : any of a phylum (Tardigrada) of microscopic invertebrates with four pairs of stout legs that live usually in water or damp moss                                      
                
called also water bear
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  Merriam-Webster unabridged




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