| Term No. | Term Name | Term Description |
| 4452 | Zawafa | An Egyptian water lifting device used for lifts exceeding two metres. It is a modern version of the chain and bucket type of Persian wheel but its des..... |
| 2667 | Zero air voids unit weight | The weight of solids per unit volume of a saturated soil mass...... |
| 708 | Zero moisture index | The index of moisture when the precipitation analysed month by month is just adequate to supply all water needed for maximum evaporation and transpira..... |
| 5000 | Zero tillage | A system whereby crops are planted into the soil without primary tillage beforehand. ..... |
| 7621 | Zero tolerance | A policy that prevents an agricultural commodity from being shipped or sold if it contains detectable levels of any chemical that has been shown to be..... |
| 8335 | Zero-wait state | A condition that results when no delays are inserted into the system software to deliberately detain operation of the CPU. This can be done with high-..... |
| 1897 | Zerophytes, or Xerophytes | Plants which can subsist with a small amount of moisture, as a desert plant or plant under conditions where excess of salts makes it difficult to take..... |
| 5180 | Zigzag drainage system | System in which field drains as well as mains are constructed zigzag to reduce high velocities. It is probable that this system is used in mechanized ..... |
| 4817 | Zigzag nozzle-line | a single nozzle-line skirting round each tree in a row in an orachard, sometime to the right, sometime to the left...... |
| 2522 | Zone | A vertical portion usually of a masonry dam between two horizontal lines of its cross section adopted for stress analysis. ..... |
| 2490 | Zone grouting | A process of providing a grout curtain whereby a whole section of the curtain is stage drilled and grouted to a limited depth before any holes are dri..... |
| 979 | Zone of aeration, Aeration zone, Zone of suspended water, or Unsaturated zone | That portion of the lithosphere in which the functional interstices of permeable rock or earth are not (except temporarily) filled with water under hy..... |
| 1143 | Zone of fluctuation of water table, or zone of phreatic fluctuations | The zone through which the water table fluctuates from its highest to its lowest level within the formation, in response to the discharge and recharge..... |
| 1148 | Zone of permanent non saturation | The strata above the highest water level reached in an aquifer when the groundwater table moves up and down in response to seasonal and shorter term w..... |
| 1149 | Zone of permanent saturation | The saturated portion of an aquifer that lies below the lowest water level reached when the groundwater table moves up and down in response to season..... |
| 978 | Zone of rock fracture | The upper part of the lithosphere, in which rocks are under stresses less than those required to close their interstices by deformation of the walls o..... |
| 982 | Zone of rock-flowage-and-fracture | That part of the earth crust lying between the zone of the rock fracture and the zone of rock flowage. In it, the strongest rocks behave as in the zon..... |
| 981 | Zone of saturation | That part of the earth crust where the functional interstices of permeable rock or earth are completely filled with water under positive hydrostatic p..... |
| 980 | Zone of weathering | The outer layer of the earth crust of the earth, including the exposed surface and that part which, as a result of porosity, cracking, and jointing, i..... |
| 6702 | Zoogeography | The study of the geographical distribution of animals...... |
| 6916 | Zoology | The study of all aspects of animal life...... |
| 8336 | Zoom | The process of proportionately enlarging or reducing an image displayed on a computer monitor...... |
| 9369 | Zoonosis | The transmission of a disease from an animal or nonhuman species to humans. The natural reservoir is a nonhuman animal...... |
| 6919 | Zoophyte | An animal that has a plant‑like form...... |
| 6920 | Zooplankton | 1 - Animal plankton. 2- See 9370....... |
