| RUL | <abbreviation> Right upper lobe (of lung). (05 Mar 2000) |
|---|---|
| rule | A statement of conditions, effects, or phenomena typically observed in agiven situation or process. (09 Oct 1997) |
| rule of bigeminy | Rule that a ventricular premature beat will follow the beat terminating a long cycle. Sudden prolongation of the ventricular cycle, by changing the refractoriness in the conduction system, causes a peripheral region of bidirectional block to become transiently unidirectional and thus opens potential pathways for reentry to occur. (05 Mar 2000) |
| rule of nines | Method used in calculating body surface area involved in burns whereby values of 9 or 18 percent of surface area are assigned to specific regions as follows: Head and neck, 9%; anterior thorax, 18%; posterior thorax, 18%; arms, 9% each; legs, 18% each; perineum 1%. (05 Mar 2000) |
| rule of outlet | An obstetric rule for determining whether the pelvic outlet will permit the passage of a foetus; the sum of the posterior sagittal diameter and the transverse diameter of the outlet must equal at least 15 cm if a normal-sized baby is to pass. (05 Mar 2000) |
| ruler | 1. One who rules; one who exercises sway or authority; a governor. "And he made him ruler over all the land." (Gen. Xii. 43) "A prince and ruler of the land." (Shak) 2. A straight or curved strip of wood, metal, etc, with a smooth edge, used for guiding a pen or pencil in drawing lines. Cf. Rule, 7 . Parallel ruler. See Parallel. Source: Websters Dictionary (01 Mar 1998) |