| ICF-MR | intermediate-care facility for the mentally retarded |
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| IMR | individual medical record; infant mortality rate; infant mortality risk; Institute for Medical Resea... |
| MRDD | mentally retarded/developmentally disabled [person] |
| NAR | nasal airway resistance; National Association for Retarded [Children, Citizens]; no action required |
| NARC | narcotic; National Association for Retarded Children; nucleus arcuatus |
| first dentition | A tooth of the first set of teeth, comprising 20 in all, that erupts between the mean ages of 6 and 28 months of life. Synonym: dens deciduus, baby tooth, deciduous dentition, dens lacteus, first dentition, milk tooth, primary dentition, primary tooth, temporary tooth. (05 Mar 2000) |
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