1. A unit of cultural information, such as a cultural practice or idea, that is transmitted verbally or by repeated action from one mind to another.
a. An image or short video clip, often accompanied by a humorous saying or popular catchphrase, that is transmitted virally, especially on social media.
b. A humorous saying or popular catchphrase that is transmitted virally, especially as a caption for such an image or video clip.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.