人じん造ぞう石せき油ゆ

noun

synthetic oil

Refers to oil produced artificially, often from coal or natural gas, as opposed to naturally occurring crude oil.

• 戦せん時じ中ちゅう、日本にほんは人じん造ぞう石せき油ゆの生せい産さんに力ちからを入いれた。

  During the war, Japan focused on producing synthetic oil.