| 单词 | heavy metal |
| 释义 | > as lemmasheavy metal heavy metal n. (see quot. 1882).extracted from heavyadj.1n.heavy metal heavy metal n. a type of loud, vigorous rock music characterized by the use of electronically amplified instruments (typically guitar, bass, and drums), a heavy (usually fast) beat, intense or spectacular performance, and often a clashing, harsh musical style. Frequently attributive or as adj.extracted from heavyadj.1n.heavy metal c. Applied to elements whose specific gravity is relatively great; heavy metal (see also sense A. 6b): a metal of high specific gravity (see quot. 1955). ΘΚΠ the world > matter > chemistry > elements and compounds > metals > [noun] > of high specific gravity heavy metal1864 society > occupation and work > materials > derived or manufactured material > metal > types of metal generally > [noun] > other types of metal solar metal1800 light metal1810 fusible metal1853 heavy metal1864 semi-metal1912 superplastic1930 the world > matter > chemistry > elements and compounds > [adjective] > of or relating to elements > whose specific gravity or atomic number is relatively high heavy1922 1864 Jrnl. Chem. Soc. 17 126 In support of the view that thallium is one of the heavy metals, the following reasons may be given. 1868 J. N. Lockyer Elem. Lessons Astron. iii. 59 Platinum, the heaviest metal. 1903 Jrnl. Physiol. 29 165 Most of the heavy metals when injected directly into the circulation give rise to increased movements of plain muscle throughout the body. 1922 F. W. Aston Isotopes viii. 101 The nucleus of the atom of an ordinary element (not hydrogen)..is very small compared with the atom itself. Its dimensions can be roughly determined by actual experiment in the case of the heavy elements. 1936 Discovery Feb. 36/1 Heavy elements, such as gold, silver, and lead. 1936 R. P. Bell tr. N. J. Bjerrum Inorg. Chem. 213 The metals fall naturally into two groups: the light metals with densities below four, and the heavy metals with densities above seven... The heavy metals have their electrons more firmly bound and are less electropositive than the light metals. 1946 Monthly Notices Royal Astron. Soc. CVI. 357 Material at any point..on the other side of the curve is composed almost entirely of heavy elements, the main mass of the elements in the latter case having atomic weight greater than 50. 1955 Chem. & Engin. News 2 May 1902/2 Karl F. Heumann wonders what is meant by ‘heavy metal’. One authority says it is any metal having a specific gravity greater than 4.0. Another says it is sometimes applied to those of sp. gr. 5.0 or over... Has ‘heavy metal’ ever been officially defined? 1961 Jrnl. Chem. Educ. 38 67/1 The present treatment will be restricted to the main process responsible for the heavy elements, of mass number A greater than 70. 1972 Science 14 Apr. 161 (title) Enrichment of heavy metals and organic compounds in the surface microlayer of Narragansett Bay, Rhode Island. < as lemmas |
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