I'm quite happy to confess that I regularly come across words I don't know. When I do then I reach for my beloved Oxford Illustrated Dictionary. In today's Daily Mail I read a brief filler in which Angelina Jolie was described as Brad's "pouting and pulchritudinous partner". Okay, trotters up if you know what pulchritudinous means. Really, wow I'm impressed. I had to look it up.
Either the filler writer was having a tedious day or they were just having fun with their thesaurus. Probably a good word to file away in the memory banks if you're a crossword fan.