intr.v. van·ished, van·ish·ing, van·ish·es
a. To pass out of sight, especially quickly; disappear. See Synonyms at disappear.
b. To pass out of existence: when the dinosaurs vanished from the earth.
2. Mathematics To become zero. Used of a function or variable.
[Middle English vanisshen, alteration of Old French esvanir, esvaniss-, from Vulgar Latin *exvanīre, alteration of Latin ēvānēscere : ē-, ex-, ex- + vānēscere, to vanish (from vānus, empty; see euə- in the Appendix of Indo-European roots).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.