• (v. i.) To flash, as lightning; to lighten; to gleam; to thunder.
Foul'der intransitive verb [ Middle English fouldre lightning, from French foudre , Old French also fouldre , from Latin fulgur . See Fulgor .] To flash, as lightning; to lighten; to gleam; to thunder. [ Obsolete] 'Flames of fouldering heat.' Spenser. ...