cluster fly
- a black fly, Pollenia rudis, slightly larger than the housefly, commonly found hibernating in large numbers in homes in the fall.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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