What does "lydian" mean?

Lydian: Of or pertaining to Lydia, a country of Asia Minor, or to its inhabitants; hence, soft; effeminate; -- said especially of one of the ancient Greek modes or keys, the music in which was of a soft, pathetic, or voluptuous character. Softly sweet in Lydian measures, Soon he soothed his soul to pleasures. Dryden. Lydian stone, a flint slate used by the ancients to try gold and silver; a touchstone. See Basanite.