柯林斯詞典sealant /?si?l?nt/ (sealants) 1. N-MASS A sealant is a substance that is used to seal holes, cracks, or gaps. 密封膠 返回 sealant劍橋詞典a substance such as paint or polish that is painted onto a surface to protect it from other liquids going into it, or is put in the space between two materials for the same reason 密封劑；防滲漏劑 返回 sealant