薬剤

1. Origins, structure, and basic meaning

• Structure: 薬剤, read やくざい, means a chemical agent used for a purpose.
• Basic usage: It refers to gardening chemicals or laboratory chemicals.

2. Common pitfalls and similar expressions

• Purpose
  • 園芸用の薬剤 is a gardening chemical.
  • 薬剤を保管している means storing chemicals.
• Use and storage
  • The first example concerns instructions before use; the second concerns locked storage.