teguPronunciation: /ˈtɛguː/Definition of tegu noun (plural same or tegus) a large stocky lizard that has dark skin with pale cross-bands of small spots, native to the tropical forests of South America. Genus Tupinambis, family Teiidae: several species, in particular the common tegu (T. teguixin) Origin: 1950s: abbreviation of teguexin, from Aztec tecoixin 'lizard'tegu in other Oxford dictionaries Definition of tegu in the US English dictionary