1. Subject to use or consumption: an expendable source.
2. Not worth salvaging or reusing: expendable rocket boosters.
3. Not strictly necessary; dispensable: an expendable budget item; expendable personnel.
4. Open to sacrifice in the interests of gaining an objective, especially a military one: expendable civilian targets.
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.