| MRXS | mental retardation, X-linked, syndrome |
|---|---|
| ONMRS | onychotrichodysplasia-neutropenia-mental retardation syndrome |
| PNM | perinatal mortality; peripheral dysostosis, nasal hypoplasia, and mental retardation [syndrome]; per... |
| SMR | senior medical resident; sensorimotor rhythm; severe mental retardation; sexual maturity rating; ske... |
| SPERM | spastic paraplegia-epilepsy-mental retardation [syndrome] |