a black fly, Pollenia rudis, slightly larger than the housefly, commonly found hibernating in large numbers in homes in the fall. Show More
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for cluster fly a dipterous fly, Pollenia rudis, that tends to gather in large numbers in attics in the autumn: family Calliphoridae. The larvae are parasitic in earthworms Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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