| AEI | arbitrary evolution index; atrial emptying index |
|---|---|
| arb | arbitrary unit |
| AU | according to custom [Lat. ad usum]; allergenic unit; ngstrom unit; antitoxin unit; arbitrary unit; A... |
| NSD | Nairobi sheep disease; neonatal staphylococcal disease; neurosecretory dysfunction; night sleep depr... |
| SE | saline enema; sanitary engineering; side effect; smoke exposure; solid extract; sphenoethmoidal; spi... |