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(zoology, US, Canada) Any land or marine reptile of the order Testudines, characterised by a protective shell enclosing its body. See also tortoise.
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(zoology, Australia, British, specifically) A marine reptile of that order.
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(military, historical) An Ancient Roman attack method, where the shields held by the soldiers hide them, not only left, right, front and back, but also from above.
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(computing) A type of robot having a domed case (and so resembling the reptile), used in education, especially for making line drawings by means of a computer program.
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(computing) An on-screen cursor that serves the same function as a turtle for drawing.
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(printing, historical) The curved plate in which the form is held in a type-revolving cylinder press.
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(computing theory) A small element towards the end of a list of items to be bubble sorted, and thus tending to take a long time to be swapped into its correct position. Compare rabbit.
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(dance) A breakdancing move consisting of a float during which the dancer's weight shifts from one hand to the other, producing rotation or a circular "walk".
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(television) A low stand for a lamp etc.