noun
snow-melting agent; de-icer
A substance, often salt or chemical, spread on roads or surfaces to melt snow and ice.
冬の道路には融雪剤がまかれている。
Snow-melting agent is spread on the roads in winter.
凍結防止剤 is a broader term for anti-freezing agents, while 融雪剤 specifically refers to melting existing snow.
Compound of 融雪 (snow melting) + 剤 (agent, chemical).