еднодневка

един (edin, “one”) +‎ -о- (-o-) +‎ днев- (dnev-, “daily”) + -ка (-ka)

• IPA^(key): [ɛdnodˈnɛfkə]

еднодне́вка • (ednodnévka) f

1. (literally) something that expires in a day

   → short-term decision, agreement

   → one-hit wonder (e.g. гру́па-еднодне́вка (grúpa-ednodnévka, “one-hit wonder group”))

2. (by extension) daypack (small tourist bagpack enough to bring supplies for one day)
3. mayfly, dayfly, ephemerid (primitive winged insect of order Ephemeroptera, with short adult life (from a few hours to 10-15 days))

   Synonym: ефемерид (efemerid)

• еди́н (edín, “one”) (numeral)
  • едини́ца (ediníca, “one”) (cardinal)
  • едини́чен (ediníčen, “single”)
  • еди́нствен (edínstven, “unique, sole”)
• дне́вен (dnéven, “daily”)

• еднодневка in Rečnik na bǎlgarskija ezik (Institut za bǎlgarski ezik)
• еднодневка in Rečnik na bǎlgarskija ezik (Čitanka.Info)