n A crown or garland bestowed among the Romans as a reward for distinguished services.
n (star) The luminousplasmaatmosphere of the Sun or other star, extending millions of kilometres into space, most easily seen during a total solar eclipse,
n (biology) Any crown-like appendage of a plant or animal.
n (electrical): a low energy discharge caused by ionization of a gas by an electric field [quite common at conductor bends of 12kV or higher].