n. pl. ig·no·ra·mus·es
An ignorant person.
[From New Latin ignōrāmus, a grand jury's endorsement upon a bill of indictment when evidence is deemed insufficient to send the case to a trial jury, from Latin, we do not know, first person pl. present tense of ignōrāre, to be ignorant; see IGNORE.]
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.