piiru

Finnish Wikipedia has an article on:

piiru

Wikipedia ^fi

• IPA^(key): /ˈpiːru/,
• Rhymes: -iːru
• Syllabification^(key): pii‧ru

piiri (“round formation of people, circle, circumference”) +‎ -u

piiru

1. (construction) rafter (one of the sloping beams that support a pitched roof)
2. (nautical) point (unit of angle equal to 1/32 of full circle or 11.25 degrees)
3. (weaponry) angular mil, mil (unit of angle equal to 1/6000 of a full circle; in other countries may also be equal to 1/6300 or 1/6400 of a full circle)
4. mark (indication or sign used for reference or measurement)
5. inch (unspecified but very short distance)

• (point): kompassipiiru
• (angular mil): tykistön piiru

• “1. piiru”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-01

From dialectal piira +‎ -u, from Swedish spira.

piiru

1. wood that has been sawed to be equally thick and wide, roughly between 100–175 mm (around 4–7 in)

• “2. piiru”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-01

Borrowed from Russian пир (pir).

piiru (dialectal)

1. (in the plural) feast

• pidot

• riipu