Side Yard means a yard of a lot extending from the front yard to the rear yard, and from the side lot line to the nearest wall of the nearest main building or structure on the lot;
Diameter means the diameter of the stem of a tree measured outside the bark at a specified point of measurement.
Basement means any area of the building having its floor subgrade (below ground level) on all sides.
Bulkhead means an airtight structure separating the working chamber from free air or from another chamber under a lower pressure than the working pressure;
Diameter at Breast Height (DBH) means the diameter of the trunk of a mature tree generally measured at a point four and a half feet above ground level from the uphill side of the tree. For species of trees where the main trunk divides below the 4 ½ foot height, the DBH shall be measured at the highest point before any division.