| iguana | (noun) large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America | Synonyms: common iguana, Iguana iguana |
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| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
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| iguanodon | (noun) massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period | - |
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