| LRI | lamina rara interna; lower respiratory [tract] illness; lower respiratory [tract] infection; lymphoc... |
|---|---|
| LRTI | lower respiratory tract illness; lower respiratory tract infection |
| MRV | minute respiratory volume; mixed respiratory vaccine |
| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |
| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |