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[From New Latin Hadrosaurus, genus name; see hadrosaurus.]
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.


(ˈhædrəˌsɔː) or


(Palaeontology) any one of a large group of bipedal Upper Cretaceous dinosaurs of the genus Anatosaurus, Maiasaura, Edmontosaurus, and related genera: partly aquatic, with a duck-billed skull and webbed feet. Also called: duck-billed dinosaur
[C19: from Greek hadros thick, fat + -saur]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhæd rəˌsɔr)

any chiefly bipedal herbivorous dinosaur of the family Hadrosauridae, of the Cretaceous Period, having a broad toothless beak.
Also called duck-billed dinosaur.
[< New Latin Hadrosaurus (1858) genus name = Greek hadr(ós) thick, bulky + -o- -o- + saûros -saur]
had`ro•sau′ri•an, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


Any of various medium-sized to large plant-eating dinosaurs of the Cretaceous Period that had a duck-like bill, hoofed feet, and many series of rough grinding teeth. The hadrosaurs were the last group of ornithopod dinosaurs. Also called duck-billed dinosaur.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hadrosaur - any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feethadrosaur - any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
ornithischian, ornithischian dinosaur - herbivorous dinosaur with a pelvis like that of a bird
family Hadrosauridae, Hadrosauridae - duck-billed dinosaurs; upper Cretaceous
anatotitan - one of the largest and most famous duck-billed dinosaurs
corythosaur, corythosaurus - duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet
edmontosaurus - duck-billed dinosaur from Canada found as a fossilized mummy with skin
trachodon, trachodont - large duck-billed dinosaur of the Cretaceous period
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Researchers from the Universities of Bristol and the Catalan Institute of Paleontology in Barcelona used a large database describing morphological variety in hadrosaur fossils and computational methods that quantify morphological variety and the pace of evolution.
Smit noted that the buried body of a Triceratops and a duck-billed hadrosaur proved without a doubt dinosaurs were still walking the Earth at the time of the impact believed to have caused the mass extinction.
Though there is hardly any evidence to confirm this theory, a group of researchers recently added more support for the idea by discovering co-occurring footprints of two late Cretaceous-era dinosaurs - hadrosaur and therizinosaur.
The Coon Creek Formation Lagerstatte preserves a diverse ecosystem of unaltered shelly invertebrates, swimming reptiles, and rare hadrosaur bone and teeth.
She located it amid the stones, and I came over to where she was squatting, inspecting the bulbous, rough-surfaced three-toed track of a hadrosaur. At least 15 inches long, it was evidence of an animal bigger than any I had ever seen, dead or alive.
Eight years ago, Tweet and colleagues reported the probable stomach contents of a hadrosaur (Brachylophosaurus canadensis) nicknamed Leonardo.
The samples included the claw of a meat-eating dinosaur, a few toe bones from a ceratopsid (a group that included the horned Triceratops) and a duck-billed hadrosaur, and rib fragments from an unknown species.
As only a single indeterminate fossil was found, no phylogenetic comparisons between this hadrosaur and contemporaneous forms in Europe and southern Appalachia can be made.
Vavrek: It's a duck-billed hadrosaur. We know the general group it's in, but because most of it was still inside of the rock we can't really tell.
Paleontologists said they have uncovered 50 vertebrae of Mexico''s first complete dinosaur tail of what they believe may be the remains of a Hadrosaur or crested duckbill dinosaur.