noun
thickened oil
Rare technical term for oil that has been thickened, used in industrial or chemical contexts.
濃化油は潤滑剤として使われることがある。
Thickened oil is sometimes used as a lubricant.
Compound of 濃化 (thickening) + 油 (oil). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.