noun
red phosphorus
Chemistry term for the red allotrope of phosphorus, used in match heads and flame retardants.
マッチの側面には赤リンが使われている。
Red phosphorus is used on the side of matchboxes.
Yellow phosphorus (white phosphorus), a different allotrope; highly toxic and reactive, unlike red phosphorus.
Compound of 赤 (red) and リン (phosphorus), from the color of this allotrope.