| SPI | Soy protein isolate |
|---|---|
| SPI | Spitz |
| SPI | serine protease inhibitor |
| SPI | soya-bean-protein isolate |
| SPI | subnucleus interpolaris |
| SPI | substance P-like immunoreactive |
| SPI1 | Salmonella Pathogenicity Island 1 |
| SPI2 | Salmonella Pathogenicity Island 2 |
| SPID | Sum of pain intensity differences |
| SPIEM | Solid phase immune electron microscopy |