guanine (n.)youdaoicibaDictYouDict
1846, from guano, from which the chemical first was isolated, + chemical suffix -ine (2).
guano (n.)youdaoicibaDictYouDict
c. 1600, from Spanish guano "dung, fertilizing excrement," especially of sea-birds on islands off Peru, from Quechua huanu "dung."
iguana (n.)youdaoicibaDictYouDict
1550s, from Spanish, from Arawakan (W.Indies) iguana, iwana, the local name for the lizard.
Foure footed beastes ... named Iuannas, muche lyke vnto Crocodiles, of eyght foote length, of moste pleasaunte taste. [Richard Eden, "Decades of the New World," 1555]
Iguanodon (n.)youdaoicibaDictYouDict
dinosaur name, 1825, hybrid from iguana + stem of Greek odonys "tooth" (on model of mastodon). So called because the fossil teeth and bones were thought to resemble those of the lizard.