| RT | radiologic technologist; radiotelemetry; radiotherapy; radium therapy; rapid tranquilization; reacti... |
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| RU | radioulnar; rat unit; reading unit; residual urine; resin uptake; resistance unit; retrograde urogra... |
| SRD | service-related disability; Society for the Relief of Distress; Society for the Right to Die; sodium... |
| URF | unidentified reading frame; uterine relaxing factor |
| WRMT | Woodcock Reading Mastery Test |
| retardation plate | <optics> A plate placed in the path of a beam of polarized light for the purpose of introducing a difference in phase. Usually a quarter-wave plate and a first-order red plate are furnished with a polarizing microscope. See: quartz wedge, compensator. (10 Mar 1998) |
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| mental retardation | Subnormal intellectual functioning which originates during the developmental period and is associated with impairment of one or more of the following: (1) maturation, (2) learning, (3) social adjustment. (12 Dec 1998) |
| Michel Levy scale of retardation colours | <microscopy> Colour chart plotting thickness of the anisotropic specimen, its birefringence (n1-n2) and its retardation in nanometres. Any one of the three variables can be determined if the other two are known. (05 Aug 1998) |
| clasped thumbs and mental retardation | A syndrome with the following characteristic features: (1) neurologically:mental retardation and aphasia (lack of speech); (2) limbs: adducted (clasped) thumbs, absent extensor pollicis longus and/or brevis muscles to the thumb, shuffling gait, and leg spasticity; (3) growth: small body size; (4) skeleton: lumbar lordosis (sway back). The syndrome is inherited as an X-linked trait and so affects mainly boys. Alternative names include MASA syndrome (MASA stands for mental retardation, aphasia, shuffling gait, and adducted thumbs), adducted thumb with mental retardation, congenital clasped thumb with mental retardation, and the Gareis-Mason syndrome. (12 Dec 1998) |
| congenital clasped thumb with mental retardation | See: Clasped thumbs and mental retardation. (12 Dec 1998) |
| psychomotor retardation | Slowed psychic activity or motor activity, or both. (05 Mar 2000) |
| intrauterine growth retardation | <radiology> Definition: less than 10th percentile for gestational age, usually not detectable before 32-34 weeks (maximal foetal growth), incidence: 3-7% of all deliveries, 12-47% of twin pregnancies complications: increased risk for perinatal asphysia, meconium aspiration, electrolyte imbalance from metabolic acidosis, polycythemia, 6-8 fold increase for intrapartum and neonatal death see also: IUGR: aetiology, IUGR: phenotypes, foetal doppler study, biophysical profile (12 Dec 1998) |
| familial mental retardation 1 | See FMR1. (12 Dec 1998) |
| familial mental retardation protein | See FMRP. (12 Dec 1998) |
| foetal growth retardation | The failure of a foetus to maintain its expected growth potential at any gestational stage. (12 Dec 1998) |