Definition of window fly
: any of several small black flies of the family Scenopinidae that are often found on windows
especially
: a fly (Scenopinus fenestralis) whose larvae feed on the larvae of the clothes moth
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“Window fly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/window%20fly. Accessed 22 Sep. 2021.
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