Of or relating to long-chain carbon compounds, especially fatty acids, having two or more double bonds between the carbon atoms. Increasing dietary intake of foods containing polyunsaturated fatty acids, including safflower, sunflower, soybean, and corn oils and cold-water fish such as salmon, can decrease LDL cholesterol levels in the bloodstream.
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.