| halo | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, nimbus |
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| (noun) a circle of light around the sun or moon | - |
| (noun) a toroidal shape | Synonyms: anchor ring, annulus, doughnut, ring |
| haloalkane | (noun) organic compound in which halogen atoms have been substituted for hydrogen atoms in an alkane | Synonyms: alkyl halide |
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| halobacter | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacteria, halobacterium |
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| halobacteria | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacterium |
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| halobacterium | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacteria |
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| halocarbon | (noun) one of various compounds of carbon and any of the halogens | - |
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| haloform | (noun) compounds with the formula CHX3, where X is a halogen atom | - |
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| halogen | (noun) 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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| halogeton | (noun) a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content | Synonyms: Halogeton glomeratus |
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| halon | (noun) a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms; very stable; used in fire extinguishers although it is thought to release bromine that depletes the ozone layer | - |
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| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| halophil | (noun) archaebacteria requiring a salt-rich environment for growth and survival | Synonyms: halophile |
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| halophile | (noun) archaebacteria requiring a salt-rich environment for growth and survival | Synonyms: halophil |
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| halophyte | (noun) plant growing naturally in very salty soil | - |
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| halothane | (noun) a nonflammable inhalation anesthetic that produces general anesthesia; used along with analgesics and muscle relaxants for many types of surgical procedures | - |
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