any of several large tortoises of the genus Geochelone, of the Galápagos Islands and islands near Madagascar: some are endangered.
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Origin of giant tortoise
First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for giant tortoise
any of various very large tortoises of the genus Testudo, of the Galápagos, Seychelles, and certain other islands, weighing up to 225 kilograms (495 lbs.)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012