| EUM | external urethral meatus |
|---|---|
| IUM | internal urethral meatus; intrauterine [fetus] malnourished; intrauterine membrane |
| UD | ulcerative dermatosis; ulnar deviation; undetermined; underdeveloped; unit dose; urethral dilatation... |
| EAM | episodic ataxia with myokymia; external acoustic meatus |
| IAM | Institute of Applied Microbiology [Japan]; Institute of Aviation Medicine; internal auditory meatus |