may·fly

[mey-flahy]
noun, plural may·flies.
1.
Also called shadfly. any insect of the order Ephemeroptera, having delicate, membranous wings with the front pair much larger than the rear and having an aquatic larval stage and a terrestrial adult stage usually lasting less than two days.
2.
Also, May fly. Angling. an artificial fly made to resemble this insect.

Origin:
1645–55; May + fly2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
mayfly (ˈmeɪˌflaɪ) [Click for IPA pronunciation guide]
 
n , pl -flies
1.  Also called: dayfly any insect of the order Ephemeroptera (or Ephemerida). The short-lived adults, found near water, have long tail appendages and large transparent wings; the larvae are aquatic
2.  angling an artificial fly resembling this

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Mayfly is always a great word to know.
So is quincunx. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Writer was hoping to be on the river coinciding with a hatch of the gib mayfly called the green drake.
The mayfly is born, lives through middle-age, and then dies.
The mayfly is known for its incredibly short adult life.
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