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sondage

noun plural -dages (-ˈdɑːʒɪz, -ˈdɑːʒ)
  1. archaeol a deep trial trench for inspecting stratigraphy
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Word Origin

C20: from French: a sounding, from sonder to sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012