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• allosaurus
  allosaurus

  noun

  allosaur.
• Allosaurus
  Allosaurus

  noun

  the genus Antrodemus.

allosaurus

¹ American  

[al-uh-sawr-uhs] / ˌæl əˈsɔr əs /

noun

allosauruses plural

1. allosaur.

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Allosaurus ² American  

[al-uh-sawr-uhs] / ˌæl əˈsɔr əs /

noun

1. Older Use. the genus Antrodemus.

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allosaurus Scientific  

/ ăl′ə-sôr′əs /

1. Any of various carnivorous dinosaurs of the genus Allosaurus of the late Jurassic and early Cretaceous Periods. Allosaurs were similar to but smaller than tyrannosaurs.

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Other Word Forms

Derived Forms

• allosauroid
  adjective

Inflected Forms

Nouns

• allosauruses
  plural

Example Sentences

See Examples For:

allosaurus Allosaurus allosauruses

I still remember being wowed by a stegosaurus trying to fend off an allosaurus and being sad about a T. rex that died trying to protect her babies.

From Los Angeles Times ● May 15, 2025

He definitely did not lead an expedition that uncovered an allosaurus skull.

From Salon ● Jun. 25, 2021

Gualicho shinyae belongs to a different type of dinosaurs called allosaurus, which scientists previously saw with strong, full-sized arms.

From Time ● Jul. 14, 2016

A fossilised allosaurus skeleton went under the hammer today at Summers Place Auctions in West Sussex.

From The Guardian ● Nov. 25, 2015

Casting a quick glance over his shoulder, Nelson's blood froze to find an allosaurus not more than seventy yards behind, and making terrible exertions to close that slender gap!

From Astounding Stories, March, 1931 by Various

At that time, some of the most iconic dinosaurs roamed the Earth, including the towering Brachiosaurus, the fierce Allosaurus, and the plate-backed Stegosaurus.

From Science Daily ● May 21, 2026

In terms of fossils, the Stegosaurus has around 144 bone elements; the adult Allosaurus has about 143, with the juvenile version having 135.

From BBC ● Dec. 12, 2024

"If you're an Allosaurus, the vast majority of the sauropods you ever encounter will be young ones, and for the first few years of their lives they will be almost defenseless," Wedel added.

From Reuters ● Nov. 16, 2023

Paleontologists have found these air sacs in flying reptiles called pterosaurs, in theropod dinosaurs such as Allosaurus, and in long-necked dinosaurs, including Diplodocus.

From Scientific American ● Mar. 31, 2023

Knight of the American Museum Expedition of 1897, had furnished interesting data as to the food and habits of Allosaurus, which were confirmed by several other fragmentary specimens obtained later in the Bone-Cabin Quarry.

From Dinosaurs With Special Reference to the American Museum Collections by Osborn, Henry Fairfield

“Some of these dinosaurs were the largest dinosaurs that ever lived. Just based on the calories alone, one dead sauropod would have enough calories to feed 20 or 30 allosauruses for several months.”

From Salon ● Nov. 2, 2023

“Recent papers about allosaurus cannibalism are pretty interesting because it means, I think, they did not care if they were scavenging sauropods or anything, even other allosauruses, they were fine with it,” he said.

From Salon ● Nov. 2, 2023

Beneath Utah’s surface, there’s a rich cache of dinosaur fossils, revealing details about prehistoric animals such as carnivorous allosauruses and spine-backed stegosauruses.

From National Geographic ● Oct. 19, 2023