| 单词 | halogens |
| 释义 | halogen /halˈə-jən/nounAny of the elements in the seventh group of the periodic table, these being fluorine, chlorine, bromine, iodine and astatine (the first four defined in the 19c as forming salts by direct union with metals; astatine discovered in 1940) ORIGIN: Gr hals salt, and -gen (1) halogenate /-ojˈ/ transitive verb To combine with a halogen halogˈenous adjective |
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