Word Study
corposant
CIDE DICTIONARY
corposant, n. [It. corpo santo holy body.].
St. Elmo's fire. See under Saint. [1913 Webster]
OXFORD DICTIONARY
corposant, n. a luminous electrical discharge sometimes seen on a ship or aircraft during a storm.
Etymology
OSp., Port., It. corpo santo holy body
For further exploring for "corposant" in Webster Dictionary Online