ETYM Latin aura air.
Emanation; atmosphere surrounding a thing or person; personality; Medicine, sensation warning of onset of epileptic fit, hysteria, etc.
1. A sensation (as of a cold breeze or bright light) that precedes the onset of certain disorders such as a migraine attack or epileptic seizure.
2. An indication of radiant light drawn around the head of a saint; SYN. halo, nimbus, glory.