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Any of various herbivorous ornithischian dinosaurs of the group Stegosauria of the Jurassic and Cretaceous Periods, having rows of upright plates or spikes on the back, spikes on the tail, and a small head with a beaked mouth. Also called stegosaur.

[From New Latin Stegosauria, group name, from Stegosaurus, type genus; see stegosaurus.]

steg′o·saur′i·an 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.


(Palaeontology) a variant of stegosaur
having the characteristics of a stegosaur
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
Rabat Paleontologists from the UK's National History Museum, in collaboration with their Moroccan counterparts, have discovered a new species of stegosaurian dinosaur.Not only is it the oldest definite stegosaur ever found, estimated to be 168 million years old, but it is also the first stegosaur to be found in North Africa.
In stegosaurian ichnotaxa such as Stegopodus Lockley and Hunt, 1998 and Deltapodus Whyte and Romano, 2001, pes prints are mesaxonic, with a triangular contour and three digit impressions forward-oriented (sensu Lockley and Hunt, 1998; Whyte and Romano, 2001).
"We describe a new stegosaurian dinosaur from the Upper Jurassic of Portugal that challenges this traditional view," he added.
In this paper we describe preliminarily new stegosaurian material from the Tithonian-Berriasian Villar del Arzobispo Formation cropping out near the villages of La Yesa and Baldovar (Valencia province, eastern Spain).