When a woman is so sexy and seductive that she almost appears other-worldly. She may even look like a fairy, nymph, or elf. Her attraction overtakes you as though she's sprinkled you with lust dust.
"Dude, did you see her? She was a total nymphtress."
"The nymphtress got me again with her moves."
"Your new haircut makes you look like a nymphtress."