any of a class of chemical compounds derived from hydrocarbons by replacing one or more hydrogen atoms by bromine atoms and other hydrogen atoms by other halogen atoms (chlorine, fluorine, or iodine). Halons are stable compounds that are used in fire extinguishers, although they may contribute to depletion of the ozone layer
Any of several compounds consisting of one or two carbon atoms combined with bromine and one or more other halogens. Halons are gases and are used as fire-extinguishing agents. They are between three and ten times more destructive to the ozone layer than CFCs are.
- Halo nevus
halo nevus n. A usually benign, sometimes multiple, melanotic nevus that involutes, producing a pigmented center that is surrounded by a uniformly depigmented zone. Also called leukoderma acquisitum centrifugum, Sutton’s disease.
[hal-oh-per-i-dawl, -dol] /ˌhæl oʊˈpɛr ɪˌdɔl, -ˌdɒl/ noun, Pharmacology. 1. a major antipsychotic agent, C 21 H 23 ClFNO 2 , used in the management of schizophrenia, severe anxiety, and other behavioral disorders. haloperidol hal·o·per·i·dol (hāl’ō-pěr’ĭ-dôl’, -dōl’) n. A tranquilizer used especially in the treatment of psychotic disorders, including schizophrenia.
halophil hal·o·phil (hāl’ə-fĭl) or hal·o·phile (-fīl’) n. An organism, especially a microorganism, that requires a high concentration of salt in its environment for optimal growth. hal’o·phil’ic (-fĭl’ĭk) adj.
[hal-uh-fahyl] /ˈhæl əˌfaɪl/ noun 1. any organism, as certain halobacteria and marine bacteria, that requires a salt-rich environment for its growth and survival. /ˈhæləʊˌfaɪl/ noun 1. an organism that thrives in an extremely salty environment, such as the Dead Sea