Meaning of “subsoil” in the English Dictionary

american-english dictionary

(Definition of “subsoil” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"subsoil" in American English

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subsoilnoun [ U ]

us /ˈsʌbˌsɔɪl/

earth science the layer of earth under the topsoil (= the layer of earth in which plants grow)

(Definition of “subsoil” from the Cambridge Academic Content Dictionary © Cambridge University Press)