1. Do or make the opposite of; reverse: decriminalize.
2. Remove or remove from: delouse; deoxygenate.
3. Out of: deplane; defenestration.
4. Reduce; degrade: declass.
5. Derived from: deverbative.
[Middle English de-, from Old French de- (from Latin dē-, from, off, apart, away, down, out, completely, from dē; see de- in the Appendix of Indo-European roots) or from Old French des-, out, off, apart, away, completely (from Latin dis-, dis-, and Latin dē-).]
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.