| NDIR | nondispersive infrared analyzer |
|---|---|
| NIR | near infrared |
| NIRS | near-infrared spectroscopy; normal inactivated rabbit serum |
| NIS | nationwide impatient sample; near-infrared intracranial spectroscopy; N-iodosuccinimide; no inflamma... |
| RAIS | reflection-absorption infrared spectroscopy |