The diacritical mark ( ~ ), used for example over the letter n in Spanish to indicate the palatal nasal sound (ny), as in cañón, "canyon," and over the vowels a and o in Portuguese to indicate nasalization, as in pão, "bread."
[Spanish, alteration of obsolete Catalan title, from Latin titulus, superscription.]
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.