noun
gold acupuncture needle
Specifically a needle made of gold, used in acupuncture. The term is technical and primarily encountered in medical or traditional medicine contexts.
金針は、銀針よりも高価だが、熱伝導率が高いとされる。
Gold needles are more expensive than silver ones, but are said to have higher thermal conductivity.
Compound of 金 (きん, 'gold') and 針 (しん, 'needle'), literally 'gold needle'. The reading しん for 針 is the on'yomi, common in medical compounds.