| PRT | Penicillium roqueforti toxin; pharmaceutical research and testing; phosphoribosyl transferase; posto... |
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| RCCT | randomized controlled clinical trial |
| RDB | random double-blind [trial] |
| RTC | random control trial; rape treatment center; renal tubular cell; residential treatment center; retur... |
| SAVE | saved-young-life equivalent; sudden A-ventilatory event; survival and ventricular enlargement [trial... |
| lighthouse lens | <physics> A lens built up, progressively, in zones or steps, each zone with its own individual radius. Considerable spherical correction is attained, and the weight of the lens is greatly reduced. Fresnel lenses were originally designed for lighthouses but they are now attainable for small spotlights, automobile headlights, and similar uses. (05 Aug 1998) |
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