1. Not fully developed: seeds with underdeveloped embryos.
2. Processed in too weak a developing solution, or for too short a time, or at too low a temperature to produce a normal degree of contrast. Used of film.
3. Having a low level of economic productivity and technological sophistication within the contemporary range of possibility; developing: underdeveloped countries.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.