1. Any of a class of proteins that are widespread in blood plasma, milk, muscle, and plant seeds and that are insoluble in pure water but soluble in dilute salt solutions. Blood serum globulins are divided into several groups, including the alpha, beta, and gamma globulins.
2. The protein fraction of blood serum containing the globulins; serum globulin.
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.