柯林斯詞典septic tank (septic tanks) 1. N-COUNT A septic tank is an underground tank where faeces, urine, and other waste matter is made harmless using bacteria. 化糞池; 汙物淨(jìng)化池 返回 septic tank劍橋詞典a large , usually underground container in which solid waste and urine are dissolved by the action of bacteria 化糞池 返回 septic tank