cluster fly

noun

Definition of cluster fly

: a large dark-brown fly (Pollenia rudis) related to the bluebottles and often gathering in large clusters in attics and other sheltered places during cool autumn weather

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Cite this Entry

“Cluster fly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cluster%20fly. Accessed 19 Jan. 2021.

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