English

Definition of septic tank noun from the Oxford Advanced Learner's Dictionary

 

septic tank

 noun
noun
BrE BrE//ˌseptɪk ˈtæŋk//
 
; NAmE NAmE//ˌseptɪk ˈtæŋk//
 
 
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a large container, usually underground, that holds human waste from toilets until the action of bacteria makes it liquid enough to be absorbed by the ground
See the Oxford Advanced American Dictionary entry: septic tank