Definition of "giant tortoise" []

• Any member or species of the genus Geochelone, land tortoises reaching 1.3 meters in length and with average life spans exceeding 100 years. (noun)
• Any of several species of reptile of the extinct genera, Cylindraspis, Dipsochelys, and the species Meiolania platyceps. (noun)

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• "On a tiny coral island called Aldabra, in the Indian Ocean, lives a species of giant tortoise less famous though no less imposing than the Galápagos tortoises."
• "Two of the doors stood open and to Thanet's surprise a head now poked out of each, as if a giant tortoise had just woken up."