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|Noun||1.||melolonthid beetle - any of various beetles of the family (or subfamily) Melolonthidae|
scarabaean, scarabaeid, scarabaeid beetle - any of numerous species of stout-bodied beetles having heads with horny spikes
cockchafer, May beetle, May bug, Melolontha melolontha - any of various large European beetles destructive to vegetation as both larvae and adult