减速剂 jiǎnsùjì moderator Definitions Defs Origin Strokes Stroke Words Sentences Sents 减速 減速 jiǎnsù verb + noun to slow down to reduce speed; to decelerate剂 劑 jì noun medicinal or chemical preparation (bound form) A substance made by mixing ingredients for a specific medical or chemical effect, such as a lotion, catalyst, or disinfectant; often found in words like 药剂 yàojì