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Definition of WHIRLING DISEASE
: an infectious often fatal disease especially of young salmonid fishes (as trout and salmon) that is caused by a protozoan (Myxobolus cerebralis syn. Myxosoma cerebralis) and is marked by skeletal deformities and a tendency to swim in circles
: an infectious often fatal disease of salmonid fish (as trout and salmon) that is caused by a protozoan (Myxobolus cerebralis synonym Myxosoma cerebralis) of the order Myxosporidia which attacks cartilage of the head and spinal cord especially of young fish and that causes the fish to swim in circles and is marked by skeletal deformities