| Nonpoint source pollution (NPSP) | (Environmental Engineering) Any pollution from a source which cannot be attributed to a particular discharge point, e.g. from agricultural crops, city streets, construction sites, etc. |
| NPDES | (Environmental Engineering) The National Pollutant Discharge Elimination System. The discharge criteria and permitting system established by the U.S. EPA as a result of the Clean Water Act and its subsequent amendments or the permit required by each discharger as a result of the Clean Water Act. |
| Receiving water | (Environmental Engineering) A water which receives wastewater (treated or otherwise) discharges. |
| Receiving water quality standards | (Environmental Engineering) Standards which require a discharger to maintain a certain quality level in the receiving water. |
| Software engineering - | (Software Engineering) a discipline that encompasses the process associated with software development, the methods used to analyze, design and test computer software, the management techniques associated with the control and monitoring of software projects and the tools used to support process, methods, and techniques. |
| disc foot | ปลายขาโต๊ะเก้าอี้ ที่มีลักษณะคล้ายจานแบนๆ |
| discolour | สีหมดไป |
| discolourate | สีตกไป |
| discurtain | เปิดม่าน |
| circulating water discharge tunnul | อุโมงค์สำหรับระบายน้ำที่ใช้ถ่ายเทหมุนเวียนแล้วทิ้ง เช่นอุโมงค์ของโรงจักรไฟฟ้า |