nacreous 

iridescent, like mother-of pearl. Of or pertaining to nacre.

Golly, what a nacreous brooch you're wearing

nacreous by clayton July 30, 2003

nacheous

adj. The feeling one has after eating too many nachos.

John: "Dude, you look totally sick."

Bob: "Yeah, I went to 7-11 and ate way too many nachos. I'm feeling really nacheous."

nacheous by Higadie August 13, 2011