| Halog | any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions |
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| Halog | a coarse annual herb introduced into North America from Siberia |
| Halog | a coarse annual herb introduced into North America from Siberia |
| Halog | Algerian plant formerly burned to obtain calcium carbonate |