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Any of various herbivorous ornithischian dinosaurs of the family Hadrosauridae of the Cretaceous Period, having a broad toothless beak, numerous teeth in the back of the jaw, a stiff tail, and sometimes a crest on the head. Also called duckbill, duck-billed dinosaur, hadrosaur.

[From New Latin Hadrosauridae, family name, from Hadrosaurus, type genus; see hadrosaurus.]

had′ro·saur′id adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
With respect to the Late Maastrichtian lambeosaurine faunas of Europe, the Serraduy humerus measures only between 40.5% and 32.5% of the length of the humerus of Pararhabdodon isonensis (Casanovas-Cladellas et al., 1987), and is as much as 19.6% smaller than the juvenile humerus of Canardia garonnensis (Prieto-Marquez et al., 2013).
Recently, the discovery of gigantic lambeosaurine specimens in sediments of similar age (Fondevilla et al., 2013) has further complicated the situation.
nov., a new lambeosaurine dinosaur (Hadrosauridae) from the Latest Cretaceous of Aren (Huesca, Spain).
(2009b): The last hadrosaurid dinosaurs of Europe: A new lambeosaurine from the uppermost Cretaceous of Aren (Huesca, Spain).
(2013): Diversity, relationships, and biogeography of the lambeosaurine dinosaurs from the European archipelago, with description of the New Aralosaurin Canardia garonnensis.
Next to the hadrosaurs, identifiable by the fossilized mandibles found in the arechological sites of La Solana (Valencia) and Fontllonga (Lleida), were a lambeosaurine hadrosaurs yet to be defined, and a newly discovered lambeosaurine, the Arenysaurus ardevoli.