v. ir·ri·tat·ed, ir·ri·tat·ing, ir·ri·tates
1. To cause (someone) to feel impatient or angry; annoy: a loud, bossy voice that irritates listeners. See Synonyms at annoy.
2. To make sore or inflamed: The smoke irritated my eyes.
3. Physiology To cause a physiological response to a stimulus in (a cell, body tissue, or organism).
To be a cause of impatience or anger.
[Latin irrītāre, irrītāt-.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. 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.