The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of several metabolic disorders marked by excessive discharge of urine and persistent thirst, especially one of the two types of diabetes mellitus.
n. A group of metabolic diseases whereby a person (or other animal) has high blood sugar due to an inability to produce, or inability to metabolize, sufficient quantities of the hormone insulin.
n. Diabetes insipidus, a condition characterized by excessive thirst and excretion of large amounts of severely diluted urine.
the GNU version of the Collaborative International Dictionary of English
n. Any of several diseases which is attended with a persistent, excessive discharge of urine; when used without qualification, the term usually refers to diabetes mellitus. The most common form is diabetes mellitus, in which the urine is not only increased in quantity, but contains saccharine matter, and the condition if untreated is generally fatal.
The Century Dictionary and Cyclopedia
n. In pathology, the name of two different affections, diabetes mellitus, or persistent glucosuria, and diabetes insipidus, or polyuria, both characterized in ordinary cases by an abnormally large discharge of urine.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a polygenic disease characterized by abnormally high glucose levels in the blood; any of several metabolic disorders marked by excessive urination and persistent thirst
Word Usage
"The word diabetes, from the Greek for “passing through,” indicates that the one and only thing diabetes insipidus and diabetes mellitus have in common is excessive discharge of urine."