1. Any of a group of organic compounds, including sugars, starches, celluloses, and gums, that contain only carbon, hydrogen, and oxygen and that originate chiefly as products of photosynthesis. Carbohydrates serve as a major energy source for living things.
2. A food, such as bread, rice, or potatoes, that is composed largely of these substances.
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.