HALOGEN

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 Dictionary entry overview: What does halogen mean? 

• HALOGEN (noun)
  The noun HALOGEN has 1 sense:

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

  Familiarity information: HALOGEN used as a noun is very rare.

 Dictionary entry details 

• HALOGEN (noun)

Sense 1

Meaning:

Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

Classified under:

Nouns denoting substances

Hypernyms ("halogen" is a kind of...):

group; grouping (any number of entities (members) considered as a unit)

Hyponyms (each of the following is a kind of "halogen"):

astatine; At; atomic number 85 (a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium)

atomic number 35; Br; bromine (a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water)

atomic number 17; chlorine; Cl (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))

atomic number 9; F; fluorine (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)

atomic number 53; I; iodin; iodine (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))

 Context examples 

Compounds consisting of carbon, hydrogen, and one or more halogen.

(Halogenated Hydrocarbon, NCI Thesaurus)

A radioactive isotope of iodine, a nonmetallic element of the halogen group.

(Iodine I-125, NCI Thesaurus)

A radioactive isotope of iodine, a nonmetallic element of the halogen group, with an atomic mass of 124 and a half-life of 4.18 days with radioisotopic activity.

(Iodine I 124, NCI Thesaurus)

A radioactive isotope of iodine, a nonmetallic element of the halogen group with an atomic mass of 123 and a half-life of 13.2 hours with radioisotopic activity.

(Iodine I-123, NCI Thesaurus)

Organohalogens consist of halogens, such as chlorine and fluorine, bonded with carbon and sometimes other elements.

(ALMA and Rosetta Detect Freon-40 in Space, ESO)

Hydrocarbons containing multiple halogen substituents (Br, Cl, Fl, I).

(Hydrocarbons, Polyhalogenated, NCI Thesaurus)

A microscopy staining method that utilizes Iodine, an element belonging to the halogen group, which specifically stains polysaccharides such as cellulose, chitin, glycogen, and starch a blue color.

(Iodine Staining Method, NCI Thesaurus)

A cyclic compound in which at least one hydrogen is replaced by a halogen (chlorine, bromine, iodine, fluorine, astatine) and exposure to this compound can increase the risk human cancer.

(Halogenated Ring Carcinogen, NCI Thesaurus)

Molecules with carcinogenic activity that almost entirely consist of carbon and hydrogen that may be cyclic or non-cyclic structures with single, double bonds or both but have at least one halogen element (chloride, bromide, fluoride, iodide, astatine) atom substituted for one of the hydrogen atoms.

(Carcinogenic Halogenated Hydrocarbon, NCI Thesaurus)

A compound with carcinogenic activity that has a carbon-based backbone that may be a cyclic or non-cyclic structure with single, double or triple bonds and can have other elements besides hydrogen incorporated in its structure but has at least one halogen (chloride, bromide, fluoride, iodide, and astatine) atom substituted for one of the hydrogen atoms.

(Organo-halide Carcinogen, NCI Thesaurus)