Source : Webster's Revised Unabridged Dictionary (1913)

Lecherous \Lech"er*ous\, a.
   Like a lecher; addicted to lewdness; lustful; also,
   lust-provoking. ``A lecherous thing is wine.'' --Chaucer. --
   {Lech"er*ous*ly}, adv. -- {Lech"er*ous*ness}, n.

Source : WordNet®

lecherousness
     n : a strong sexual desire [syn: {lust}, {lustfulness}]