| water pennywort | <botany> Marsh pennywort. See Marsh. Source: Websters Dictionary (01 Mar 1998) |
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| water pepper | <botany> Smartweed. Synonym: waterwort. Source: Websters Dictionary (01 Mar 1998) |
| water pheasant | <zoology> The pintail. See Pintail. The goosander. The hooded merganser. Source: Websters Dictionary (01 Mar 1998) |
| water piet | <zoology> The water ousel. Source: Websters Dictionary (01 Mar 1998) |
| water pig | 1. <zoology> The capybara. 2. <zoology> The gourami. Source: Websters Dictionary (01 Mar 1998) |
| water pimpernel | <botany> A small white-flowered shrub; brookweed. Source: Websters Dictionary (01 Mar 1998) |
| water pitcher | 1. A pitcher for water. 2. <botany> One of a family of plants having pitcher-shaped leaves. The sidesaddle flower (Sarracenia purpurea) is the type. Source: Websters Dictionary (01 Mar 1998) |
| water plant | A plant that grows in water; an aquatic plant. Source: Websters Dictionary (01 Mar 1998) |
| water plantain | <botany> A kind of plant with acrid leaves. See Plantain. Source: Websters Dictionary (01 Mar 1998) |
| water poa | <botany> Meadow reed grass. See Reed. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| 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) |