1. a bipedal dinosaur of the genus Hadrosaurus, belonging to the ornithopod family Hadrosauridae of the late Cretaceous Period, having broad, flat jaws for scooping up water plants.

Origin of hadrosaur

< New Latin Hadrosaurus (1858) genus name, equivalent to Greek hadr(ós) thick, bulky + -o- -o- + saûros -saur
Related formshad·ro·sau·ri·an, adjective
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British Dictionary definitions for hadrosaur


hadrosaurus (ˌhædrəˈsɔːrəs)

  1. 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 feetAlso called: duck-billed dinosaur

Word Origin for hadrosaur

C19: from Greek hadros thick, fat + -saur
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for hadrosaur

1877, from Modern Latin hadrosaurus, from Greek hadros "thick, stout" (see hadron) + -saurus.

Online Etymology Dictionary, © 2010 Douglas Harper

hadrosaur in Science


  1. Any of various medium-sized to large dinosaurs of the group Hadrosauroidea of the Cretaceous Period. Hadrosaurs had a duck-like bill and a mouth containing many series of rough grinding teeth for chewing tough plants. They walked on two legs or on all fours and had hoofed feet. Many hadrosaurs bore hollow crests on their skulls. They were the last and largest ornithopod dinosaurs. Also called duck-billed dinosaur
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.