Definitions for "Rapids"
A fast and turbulent stretch of water which could include waves, haystacks, stoppers and drops. Rapids are graded 1 to 6 on the international scale.
A part of a river with turbulent water caused by the uneven nature of the river bed. Often this is caused by the river flowing over narrow bands of hard and soft rock: they are like a series of small waterfalls. hard rock soft rock waterfall
Rough water caused by moving water over rocks.
Rapids: Persistence and Distribution at Glasgow (UK)
Reengineering Acquisition, Payment and Information Disposition Systems
Regional Air Pollutant Inventory Development System. RAPIDS contains statewide air emissions inventories of 49 pollutants of concern to the Great Lakes. The inventory contains emissions estimates for point and area sources of toxic air pollutants.
radar passive identification system