Bifid, Propitiary, Coriaceous

Thanks to my vocabulary-lovin’ mother, last night I spent a couple of hours wasting time at, where for every three correct word definitions you move up one level. Each wrong answer knocks you back a level. Supposedly there’s a 50th level and no one can get past 48. I could only manage a brief stay at 45, but it was a glorious, shiny moment. Oh, and the site is some kind of fundraiser for world hunger.