1. radius.
2. Com. registered (def. 2).
3. Elect. resistance.
4. Physics. roentgen.
5. royal.
6. ruble.
7. pl. rs , rupee.
Ecol.
the theoretical intrinsic rate of increase of a population, equivalent to the difference between the birth and death rates divided by the number of individuals in the population. Also called Malthusian parameter .