sondage

noun
son·​dage | \ (ˈ)sän¦däzh\
plural sondages\ -​zh(ə̇z) \

Definition of sondage

: a sounding of the earth (as by boring or digging) preliminary to archaeological excavation : a trial excavation

History and Etymology for sondage

French, literally, sounding, from sonder to sound + -age

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