The Collaborative International Dictionary
Foulder
Foulder \Foul"der\, v. i. [OE. fouldre lightning, fr. F. foudre,
OF. also fouldre, fr. L. fulgur. See Fulgor.]
To flash, as lightning; to lighten; to gleam; to thunder.
[Obs.] ``Flames of fouldering heat.''
--Spenser.
Wiktionary
foulder
vb. (context obsolete English) To flash like lightning; to lighten; to gleam; to thunder.