retardant
noun [ C or U ], adjective uk/rɪˈtɑː.dənt/ us/rɪˈtɑːr.dənt/
起阻滞作用的，阻止的；阻滞剂，阻化剂
(a substance) that makes the progress or growth of something slower
Potted plants are commonly treated with (a) growth retardant so that they retain their shape. 盆栽植物一般都施用阻长剂以保持其形态。
fire/flame retardant furniture (= furniture that does not burn easily) 阻燃家具