Etymology
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gecko (n.)

1774, from Malay (Austronesian) gekoq, said to be imitative of its cry. Earlier forms in English were chacco (1711), jackoa (1727).

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Definitions of gecko

gecko (n.)
any of various small chiefly tropical and usually nocturnal insectivorous terrestrial lizards typically with immovable eyelids; completely harmless;
From wordnet.princeton.edu