noun
also col·um·na·ris ˌkäləmˈna(a)rə̇s
( -es )
Etymology: New Latin columnaris, specific epithet of Chondrococcus columnaris, species causing the disease, from Late Latin, columnar
: a highly fatal disease of fingerling trout and salmon especially when concentrated in hatchery ponds that is caused by a myxobacterium ( Chondrococcus columnaris )