a branch of knowledge that deals with living organisms 

         having the power to eat away as if by gnawing

         rejoiced

         a large freshwater fish noted for its long life

        damaged or made worse by making smaller, less, or weaker

        to set or make right   

         to bend a ray when it passes from one medium into another

        to burn or scorch as with sudden heat

        of, relating to, or containing sulfur

        concerned with or necessary to the continuation of life