| R&R | rate and rhythm; rest and recuperation |
|---|---|
| RT | radiologic technologist; radiotelemetry; radiotherapy; radium therapy; rapid tranquilization; reacti... |
| SBR | small bowel resection; spleen-to-body [weight] ratio; strict bed rest; styrene-butadiene rubber |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| BDR | Back-ground Diabetic Retinopathy |
| topping and back pressure turbine | Turbines which operate at exhaust pressure considerably higher than atmospheric (noncondensing turbines). These turbines are often multistage types with relatively high efficiency. (05 Dec 1998) |
|---|---|
| true muscles of back | Muscles of the back innervated by the dorsal primary rami of spinal nerves; includes erector spinae, transversospinalis, interspinal, and intertransverse muscles; excludes the superficial back muscles which are appendicular and are innervated by ventral rami, and the trapezius, innervated by the spinal accessory nerve. Synonym: true muscles of back. (05 Mar 2000) |
| fold-back elements | A type of transposable element that possesses long inverted repeats, such that when denatured, loops are formed. (05 Mar 2000) |
| low back pain | A continuous pain in the lower back or lumbar region. (12 Dec 1998) |