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The English word metal is derived from the Latin word metallum, in turn derived from the Greek metallon, meaning a mine or quarry, as well as ore or metal. Thus, the word originally meant anything useful dug up from the ground, including stone, sand, clay or rocks. This meaning survives in the term road metal.- In chemistry, a metal is a chemical element that readily forms cations and bonds ionically.
- In road pavement metal is a type of pavement.
- In music, metal (Heavy Metal) is a genre of music.
- In astronomy, a metal is any element other than hydrogen or helium. This distinction is significant because hydrogen and helium (together with trace amounts of lithiumThis article is about Lithium, the element. For the article on mood-stabilizing drugs, see Lithium salt. Lithium is the chemical element with symbol Li and atomic number 3. In the periodic table, it is located in group 1, among the alkali metals. Lithium) are the only elements that occur naturally without the fusionIn physics, nuclear fusion (a thermonuclear reaction is a process in which two nuclei join, forming a larger nucleus and releasing energy. Nuclear fusion is the energy source which causes stars to shine, and hydrogen bombs to explode. It takes considerabl activity of starFor alternate meanings see star (disambiguation Hubble Space Telescope of the Sagittarius Star Cloud in the Milky Way Galaxy. A star is any massive gaseous celestial body in outer space. Stars appear as shining points in the nighttime sky that twinkle becs. Thus, the metallicityIn astronomy, the metallicity of an object is the proportion of its matter made up of elements other than hydrogen and helium. All heavier elements are described in astronomy as metals. The metallicity of an object can give an indication of its age. When of a galaxyThis article is about a celestial body. For alternate meanings see galaxy (disambiguation). Spiral Galaxy ESO 269-57 is about 150 million light-years away and 200,000 light-years across. Stars are almost always found in collections called galaxies togethe or other object is an indication of past stellar activity.
- In ChineseThis article is on the geographic and cultural entity. For other meanings, see China (disambiguation). China ( Traditional Chinese: , Simplified Chinese: , Hanyu Pinyin: Zhongguo, Wade-Giles: Chung-kuo) is a country in continental East Asia with some oute TaoismFor other uses of the words "tao" and "dao", see Tao (disambiguation) and Dao (disambiguation). Taoism or Daoism is usually described as an Asian philosophy and religion, although it is also said to be neither but rather an aspect of Chinese wisdom. The T, metal is one of the Five Elements.
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