A circular band of coloured light, visible around the sun or moon etc., caused by reflection and refraction of light by ice crystals in the atmosphere.

(transitive) To encircle with a halo.

plural of HALO

sea, salt, salt water

(chemistry) Forming names of chemical compounds which contain one or more halogen atoms.

(astronomy) A diffuse region of material, surrounding a galaxy or a pulsar, that emits radio waves

(physics) An atomic nucleus whose radius is appreciably larger than that predicted by the liquid drop model (wherein the nucleus is assumed to be a sphere of constant density).

(astronomy, meteorology) an upper atmospheric optical phenomena associated with thunderstorms, diffuse disk shaped glows that precede sprites and propagate downward

(astronomy) An aggregation of individual stars, dust, and gas (and possibly dark matter) that surrounds a galaxy

(psychology) A cognitive bias in which judgment of somebody's character is influenced by an overall impression of him or her.