halos: signification et définitions

A luminous ring or disk of light surrounding the heads or bodies of sacred figures, such as saints, in religious paintings; a nimbus. A ring or disk resembling the halo of a sacred figure:"She had a halo of red hair floating over a delicate ivory face"(Judith Ortiz Cofer). A feeling of glory, reverence, or admiration associated with a person or thing:"By the 1930s, insulin's halo had begun to tarnish, for it became clear that patients who had the illness .. were prone to problems of the small blood vessel"(James S. Hirsch).

A circular band of colored light around a light source, as around the sun or moon, caused by the refraction and reflection of light by ice particles suspended in the intervening atmosphere. A roughly spherical region of relatively dust-free space surrounding a galaxy and extending beyond the visible parts of the galaxy. Galactic halos contain stars (often located in globular clusters), gas, and dark matter.