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1. A type of metallic element, symbol Hf, with a high melting point and coexists with zirconium. It is used as the cathode in X-ray tubes, and alloys of hafnium with tungsten or molybdenum are used as electrodes in high-pressure discharge tubes.
2. Surrounding or encircling, as in "purple curtains surround, green screens encircle."
3. (Hafnium)