Saint Mark's fly

\ -ˈmärks- \

Definition of Saint Mark's fly

: a large black angular European bibionid fly (Bibio marci) that usually emerges about the end of April

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History and Etymology for Saint Mark's fly

after St. Mark the Evangelist, whose feast day is April 25

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Cite this Entry

“Saint Mark's fly.” Dictionary, Merriam-Webster, Accessed 24 Oct. 2021.

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