| Acronym | Meaning |
| SAN | Styrene-acrylonitrile Copolymer |
| NOS | Nitric Oxide Synthase |
| FGRM | Fourier-grid R-matrix Formalism (in Scattering Problems) |
| CERL | Construction Engineering Research Laboratory (US Army) |
| MCV | Mean Corpuscular Volume |
| PKD | Polycystic Kidney Disease |
| EMPT | Effective Medium Percolation Theory |
| NSES | National Science Education Standards |
| NCLAP | National Crop Loss Assessment Program |
| MRS | Monitored Retrievable Storage (for Radioactive Wastes) |