染せん色しき素そ

noun

coloring principle; pigment

Technical term used in biology and chemistry for a substance that imparts color, such as a natural pigment or dye component.

• この植しょく物ぶつの染せん色しき素そは、布ぬのを鮮あざやかな赤あかに染そめる。

  The coloring principle of this plant dyes cloth a vivid red.