Top Definition
Character / Element in the Discworld series, often referred to as "Great A'Tuin". Species of star turtle (Chelys Galactica) that carries the four great elephants Berilia, Tubul, Great T'Phon and Jerakeen on it's back, who in turn support Discworld itself.

Gender is unknown.
Great A'Tuin is the foundation of the foundation of Discworld.
by Starfyre June 23, 2005

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