重じゅう質しつ油ゆ

noun

heavy oil

Technical term for petroleum fractions with high density and boiling point, often contrasted with 軽質油 (light oil).

See also: 軽質油

• 重じゅう質しつ油ゆは軽けい質しつ油ゆに比くらべて精せい製せいが難むずかしい。

  Heavy oil is more difficult to refine than light oil.