| ETA | electron transfer agent; endotracheal airways; ethionamide |
|---|---|
| h | Greek letter eta; absolute viscosity |
| S | Greek capital letter sigma; syphilis; summation of series |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |