n.
Function: noun
Date: 14th century
1 a : a usually cylindrical hole made by or as if by boring b chiefly Australian & New Zealand : a borehole drilled especially to make an artesian well
2 a : the long usually cylindrical hollow part of something (as a tube or gun barrel) b : the inner surface of a hollow cylindrical object
3 : the size of a bore: as a : the interior diameter of a gun barrel especially chiefly British : GAUGE 1A(2) b : the diameter of an engine cylinder