Etymology
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whatnot (n.)

also what-not, 1530s, "anything," from what + not. Elliptical for "what may I not say," implying "everything else." As the name of a furniture item, first attested 1808, so named for the objects it is meant to hold.

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Definitions of whatnot

whatnot (n.)
miscellaneous curios;
Synonyms: bric-a-brac / knickknack / nicknack / knickknackery
From wordnet.princeton.edu