stegosaur[stĕgˈə-sôrˌ] also steg·o·sau·rus [stĕgˌə-sôrˈəs]
stegosaur definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of several herbivorous dinosaurs of the suborder Stegosauria of the Jurassic to the Cretaceous periods, having a double row of upright bony plates along the back, long hind legs, a short neck, and a relatively small head.
Origin: New Latin Stegosaurus, genus name : Greek stegos, roof; see stegodon + Greek sauros, lizard.
stegosaur - Science Definition
Any of several large herbivorous ornithischian dinosaurs of the group Stegosauria of the Jurassic and early Cretaceous Periods. The largest genus, Stegosaurus, had a tail with two horizontal spikes for defense, and an arched back with an alternating double row of large, triangular, upright bony plates. Stegosaurs grew over 6 m (20 ft) long, but had extremely small heads with brains the size of a walnut. The hindquarters were controlled by a neural ganglion in the hip region that was larger than the brain.