禁忌

1. Origins, structure, and basic meaning

• Structure: 禁忌 (きんき) is a noun for a prohibition established by social, religious, or medical rules.
• Basic usage: 行為が禁忌とされる classifies an act as taboo under local custom, while 禁忌の有無を確認する checks whether a prohibited drug combination exists.

2. Common pitfalls and similar expressions

• Customary taboo and medical contraindication
  • 禁忌とされる行為 is a social norm, whereas 薬の禁忌 is a medical condition forbidding a combination. The basis of prohibition differs between the two domains.