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stability ball


any of variously sized large balls used for doing exercises and for physical therapy


The stability ball is also called a balance ball, birth ball, body ball, exercise ball, fitness ball, gym ball, gymnastic ball, physioball, sports ball, Swedish ball, or therapy ball.

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1995's 21st Century Lexicon
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Examples from the Web for square pyramid
Historical Examples
  • At the end of the building is the royal tomb, consisting of a square pyramid and containing the body of Imandes.

    Mazes and Labyrinths W. H. Matthews
  • A stick of timber is in the shape of the frustum of a square pyramid, the lower base being 22 in.

    The Psychology of Arithmetic Edward L. Thorndike
  • A square pyramid is placed on the top of the tower, and the whole is suitably coloured.

    Toy-Making in School and Home Ruby Kathleen Polkinghorne and Mabel Irene Rutherford Polkinghorne
  • As this number is the square of 70, we can lay out the balls in a square, and can form a square pyramid with them.

    Amusements in Mathematics Henry Ernest Dudeney

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