| water partridge | <zoology> The ruddy duck. Source: Websters Dictionary (01 Mar 1998) |
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| water pennywort | <botany> Marsh pennywort. See Marsh. Source: Websters Dictionary (01 Mar 1998) |
| 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) |