halogen
English Thesaurus
1. any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions (noun.substance)
| hypernym | : | group, grouping, |
| definition | : | any number of entities (members) considered as a unit (noun.tops) |
| hyponym | : | astatine, at, atomic number 85, |
| definition | : | a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium (noun.substance) |
| hyponym | : | atomic number 35, br, bromine, |
| definition | : | a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water (noun.substance) |
| hyponym | : | atomic number 17, chlorine, cl, |
| definition | : | a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water) (noun.substance) |
| hyponym | : | atomic number 9, f, fluorine, |
| definition | : | a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite (noun.substance) |
| hyponym | : | atomic number 53, i, iodin, iodine, |
| definition | : | a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) (noun.substance) |
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