Piru (spirit)

A piru is a fiend or demon in Finnish mythology. The word is inherited from Proto-Finnic *piru* ‘devil, demon’, with cognates in Karelian, Ingrian and Estonian;[1] its ultimate origin is unknown.[2][3][4]

In folklore, a piru is often featured as a nasty spirit of the forest with which a smart aleck either wins or loses a battle of wits, giving or receiving a forfeit in return. In many cases, poltergeist and haunting phenomena are described as "pirus". The Devil may be referred to as (proper noun) Piru, or Pääpiru, the main piru.

"Piru" is also a mild swearword in Finnish.

References

  1. ^ "piru – Suomen etymologinen sanakirja (online)". Kotimaisten kielten keskus (Kotus) (in Finnish). Retrieved 26 August 2025.
  2. ^ Itkonen, Erkki; Kulonen, Ulla-Maija, eds. (1995). Suomen sanojen alkuperä: Etymologinen sanakirja. Vol. 2. Helsinki: Kotimaisten kielten tutkimuskeskus; Suomalaisen Kirjallisuuden Seura.
  3. ^ Karjalan kielen sanakirja. Helsinki: Suomalaisen Kirjallisuuden Seura. 1968–2005.
  4. ^ Häkkinen, Kaisa (2004). Nykysuomen etymologinen sanakirja. Helsinki: WSOY.
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