adit

noun
ad·it | \ ˈa-dət \

Definition of adit 

: a nearly horizontal passage from the surface in a mine

First Known Use of adit

1602, in the meaning defined above

History and Etymology for adit

borrowed from Latin aditus "approach, entrance," from adi-, stem of adīre "to go to, approach" (from ad- ad- + īre "to go") + -tus, suffix of action nouns — more at issue entry 1

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The first known use of adit was in 1602

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