| water pollutants | Substances which pollute the water or bodies of water. Use for water pollutants in general or for which there is no specific heading. (12 Dec 1998) |
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| water pollutants, chemical | Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water. (12 Dec 1998) |
| water pollutants, radioactive | Pollutants, present in water or bodies of water, which exhibit radioactivity. (12 Dec 1998) |
| water pore | 1. <zoology> A pore by which the water tubes of various invertebrates open externally. 2. <botany> One of certain minute pores in the leaves of some plants. They are without true guardian cells, but in other respects closely resemble ordinary stomata. Source: Websters Dictionary (01 Mar 1998) |
| water potential | <plant biology> The chemical potential (i.e. Free energy per mole) of water in plants. Water moves within plants from regions of high water potential to regions of lower water potential, i.e. Down gradient. (18 Nov 1997) |
| water pox | varicella Previous: water pollutants, radioactive, water pore, waterpot, water potentialNext: water pox, water purification, water purslane, water qualmwater pox <medicine> A variety of chicken pox, or varicella. Source: Websters Dictionary (01 Mar 1998) |
| water purification | Any of several processes in which undesirable impurities in water are removed or neutralised; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of waste water to provide potable and hygiene water in a controlled or closed environment as well as provision of public drinking water supplies. (12 Dec 1998) |
| water purslane | <botany> See Purslane. Source: Websters Dictionary (01 Mar 1998) |
| water qualm | <medicine> See Water brash, under Brash. Source: Websters Dictionary (01 Mar 1998) |
| water rabbit | <zoology> See Water hare. Source: Websters Dictionary (01 Mar 1998) |
| water radish | <botany> A coarse yellow-flowered plant (Nasturtium amphibium) related to the water cress and to the horse-radish. Source: Websters Dictionary (01 Mar 1998) |
| water rail | <zoology> Any one of numerous species of rails of the genus Rallus, as the common European species (Rallus aquaticus). Source: Websters Dictionary (01 Mar 1998) |
| water rat | 1. <zoology> The water vole. See Vole. The muskrat. The beaver rat. See Beaver. 2. A thief on the water; a pirate. Source: Websters Dictionary (01 Mar 1998) |
| water rattler | <zoology> The diamond rattlesnake (Crotalus adamanteus); so called from its preference for damp places near water. Source: Websters Dictionary (01 Mar 1998) |
| water rocket | 1. <botany> A cruciferous plant (Nasturtium sylvestre) with small yellow flowers. 2. A kind of firework to be discharged in the water. Source: Websters Dictionary (01 Mar 1998) |