water level
noun
1
                    
                                          
              
          
                                                      : an instrument to show the level by means of the surface of water in a trough or in a U-shaped tube                                      
                
                    
2
                    
                                          
              
          
                                                      : the surface of still water: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : the level assumed by the surface of a particular body or column of water                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the waterline of a vessel                                      
                
                    
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  Merriam-Webster unabridged




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