| RCM | radial contour model; radiographic contrast medium; red cell mass; reinforced clostridial medium; re... |
|---|---|
| RSM | risk screening model; Royal Society of Medicine |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SPM | shocks per minute; spermine; subhuman primate model; suspended particulate matter; synaptic plasma m... |
| T90 | time required for 90% mortality in a population of microorganisms exposed to a toxic agent |