corposant(n = noun.phenomenon) corona, corona discharge, electric glow, saint elmo's fire, saint elmo's light, saint ulmo's fire, saint ulmo's light, st. elmo's fire - an electrical discharge accompanied by ionization of surrounding atmosphere;
is a kind of arc, discharge, electric arc, electric discharge, spark
St. Elmo's fire. See under Saint. [1913 Webster]
corposant, n. a luminous electrical discharge sometimes seen on a ship or aircraft during a storm.
Etymology:
OSp., Port., It. corpo santo holy body