noun
nozurazumi; dry stone castle wall construction
A traditional Japanese castle wall building technique using uncut, natural stones stacked without mortar. The term is specific to historical architecture and castle studies.
この城の石垣は野面積みで築かれている。
The stone walls of this castle are built using the nozurazumi method.
野面積みは、自然石をそのまま積み上げる工法だ。
Nozurazumi is a construction method in which natural stones are stacked as they are.
The term combines 野面 (のづら, 'natural rock surface') and 積み (づみ, 'stacking'), referring to the use of uncut stones in wall construction. The exact historical origin of the term is uncertain, but it is a well-established technical term in Japanese castle architecture.