top·sail (tŏpsəl, -sāl′)
1. A square sail set above the lowest sail on the mast of a square-rigged sailing vessel.
2. A triangular or square sail set above the gaff of a lower sail on a fore-and-aft-rigged sailing vessel.
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.