thaumatrope Hear it!

thaumatrope Definition

thau·ma·trope (t̸hô′mə trōp′)

noun

a device consisting of a card or disk with different designs on either side, which, when the card or disk is twirled, appear to blend into one: it demonstrates the persistence of vision

Etymology: Gr thauma (see thaumatology) + -trope