any of a group of proteins, fully soluble only in salt solutions, found in both animal and vegetable tissues
Origin:
globul(e) + -in
See globulin in American Heritage Dictionary 4
noun
Any of a class of proteins that are found extensively in blood plasma, milk, muscle, and plant seeds and that are insoluble in pure water and half saturated ammonium sulfate, soluble in dilute salt solution, and coagulable by heat.