a carnivorous dinosaur of the genus Antrodemus (formerly Allosaurus), from the late Jurassic Period of North America, that was about 30 feet (9 meters) long.

Nearby words

  1. alloploidy,
  2. allopolyploid,
  3. allopsychic,
  4. allopurinol,
  5. allorhythmia,
  6. allosaurus,
  7. allosome,
  8. allosteric,
  9. allosteric site,
  10. allosterism

Origin of allosaur

< New Latin Allosaurus (1877). See allo-, -saur Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for allosaur


allosaurus (ˌæləˈsɔːrəs)


any large carnivorous bipedal dinosaur of the genus Antrodemus (formerly Allosaurus), common in North America in late Jurassic times: suborder Theropoda (theropods)

Word Origin for allosaur

C19: from allo- + -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

Science definitions for allosaur


[ăl′ə-sôrəs]allosaur (ălə-sôr′)

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.