A condition in which glucose is discharged in the
urine; diabetes mellitus.
1. To lie under; to rest beneath; to be situated under; as, a stratum of clay underlies the surface gravel. 2. To be at the basis of; to form the foundation of; to support; as, a doctrine underlying a theory. 3. To be subject or amenable to. [R.] The knight of Ivanhoe . . . underlies the challenge of Brian der Boi...