Ho·mo e·rec·tus (hōmō ĭ-rĕktəs)
A species of extinct humans known from fossil remains found in Africa and Eurasia and dating from about 1.9 million to less than 100,000 years ago. Homo erectus is widely regarded as an ancestor of Homo sapiens.
[New Latin Homō ērēctus, species name : Latin homō, man + Latin ērēctus, upright.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.