peruskivi

perus- (“base”) +‎ kivi (“stone”)

• IPA^(key): /ˈperusˌkiʋi/,
• Rhymes: -iʋi
• Syllabification^(key): pe‧rus‧ki‧vi

peruskivi

1. cornerstone (ceremonial stone set at the foundation of a building, often in the corner and inscribed with the completion year and other details)
2. foundation stone
3. (figuratively) cornerstone (that which is prominent, fundamental, noteworthy, or central)

In current Finnish practice a kulmakivi is a hollow block hidden in the foundation of a building, inside which a time capsule is placed in a ceremony called peruskiven muuraus (“groundbreaking”) and then sealed with bricks and mortar.

• (that which is fundamental): kulmakivi

• “peruskivi”, 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 2023-07-03