whirling

whirl

verb

{bc}to move in a circle or similar curve especially with force or speed

whirl*ing disease

noun

{bc}an infectious often fatal disease especially of young salmonid fishes (such as trout and salmon) that is caused by a protozoan ({it}Myxobolus cerebralis{/it} synonym {it}Myxosoma cerebralis{/it}) and is marked by skeletal deformities and a tendency to swim in circles