Etymology
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tortoise (n.)

1550s, altered (perhaps by influence of porpoise) from Middle English tortuse (late 15c.), tortuce (mid-15c.), tortuge (late 14c.), from Medieval Latin tortuca (mid-13c.), perhaps from Late Latin tartaruchus "of the underworld" (see Tartarus). Others propose a source in Latin tortus "twisted," based on the shape of the feet. The classical Latin word was testudo, from testa "shell." First record of tortoise shell as a pattern of markings is from 1782.

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Definitions of tortoise

tortoise (n.)
usually herbivorous land turtles having clawed elephant-like limbs; worldwide in arid area except Australia and Antarctica;
From wordnet.princeton.edu