1. Lying in a straight line.
2. Relating to a device whose linkage produces or copies motion in straight lines.
3. Meteorology Relating to or being a powerful and often destructive wind that moves in a straight rather than circular path as the leading edge of a thunderstorm or as the result of a downburst.
4. Accounting Of or being a mode of amortization by equal payments at stated intervals over a given period of time.
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.