精製

1. Origins, structure, and basic meaning

• Structure: 精製, read せいせい, means removing impurities to make a substance purer.
• Basic usage: Use it for refining oil from raw materials or describing the refining process.

2. Common pitfalls and similar expressions

• Manufacturing and refining
  • 製造 broadly means manufacturing, while 精製 focuses on reducing impurities in a substance.
• What is refined
  • In the example 油を精製している, を marks the substance being refined.