noun
artificial stone; fake rock
Refers to man-made stone materials used in construction, decoration, or landscaping. Contrasts with 自然石 (natural stone).
See also: 自然石
この庭園の岩は人造石でできている。
The rocks in this garden are made of artificial stone.
自然石 means natural stone, while 人造石 is man-made artificial stone.
Compound of 人造 (man-made) and 石 (stone).