The Collaborative International Dictionary of English v.0.48:

Whatnot \What"not\ (hw[o^]t"n[o^]t), Whatnot shelf \What"not
shelf`\ (hw[o^]t"n[o^]t sh[e^]lf`), n. [See the Note under
   What, pron., 5.]
   A kind of stand, or piece of furniture, having shelves for
   books, ornaments, etc.; an ['e]tag[`e]re.
   [1913 Webster]

WordNet (r) 3.0 (2006):

whatnot
    n 1: miscellaneous curios [syn: bric-a-brac, knickknack,
         nicknack, knickknackery, whatnot]