An inherited metabolic disorder characterized by deficiency of an enzyme necessary for the metabolism of galactose, a sugar found in milk, milk products, many legumes, and organ meats. The disorder results in elevated levels of galactose in the blood and can lead to intellectual disability and eye and liver abnormalities.
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.