原油

1. Origins, structure, and basic meaning

• Structure: 原油, read げんゆ, denotes crude oil before refining.
• Basic usage: In 大型タンカーが港へ原油を運んできた。, a large tanker brought crude oil to the harbor.

2. Common pitfalls and similar expressions

• 油 and 原油
  • 油 broadly means oil, while 原油 specifically denotes unrefined petroleum. 原油 is not a general label that includes cooking oil.