1. The title, subtitle, or topic that stands at the top or beginning, as of a paragraph, letter, or chapter.
2. The course or direction in which a ship or aircraft is pointing or moving.
a. A gallery or drift in a mine.
b. The end of a gallery or drift.
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.