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cluster fly

noun

  1. a black fly, Pollenia rudis, slightly larger than the housefly, commonly found hibernating in large numbers in homes in the fall.


cluster fly

noun

  1. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Example Sentences

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“But just as often it’s, like, a flesh fly, a bottle fly or a cluster fly, and those are really great and interesting species that you should know about.”

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The common occurrence in such places of the cluster fly and a few other species, which may be easily mistaken for the house fly, is responsible for the prevailing belief as to the way the house fly overwinters.

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It gets its name of "cluster fly" from its habit of collecting in compact groups or clusters in protected corners during cold periods.

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