| water trefoil | <botany> The buck bean. Source: Websters Dictionary (01 Mar 1998) |
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| water tube | <zoology> One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. Source: Websters Dictionary (01 Mar 1998) |
| water tupelo | <botany> A species of large tupelo (Nyssa aquatica) growing in swamps in the southern of the United States. See Ogeechee lime. Source: Websters Dictionary (01 Mar 1998) |
| water turkey | <zoology> The American snakebird. See Snakebird. Source: Websters Dictionary (01 Mar 1998) |
| water vine | <botany> Any plant of the genus Phytocrene, climbing shrubs of Asia and Africa, the stems of which are singularly porous, and when cut stream with a limpid potable juice. Source: Websters Dictionary (01 Mar 1998) |
| water violet | <botany> See Violet. Source: Websters Dictionary (01 Mar 1998) |
| water viper | <zoology> See Water moccasin. Source: Websters Dictionary (01 Mar 1998) |
| water vole | <zoology> See Vole. Source: Websters Dictionary (01 Mar 1998) |
| water wheel murmur | Churning cardiac murmur produced by air embolism to the heart; also heard in pneumohydropericardium. Synonym: water wheel murmur. (05 Mar 2000) |
| water-whistle sound | A bubbling whistle heard on auscultation over a bronchial or pulmonary fistula. (05 Mar 2000) |
| water-white | <botany> A vinelike plant (Vitis Caribaea) growing in parched districts in the West Indies, and containing a great amount of sap which is sometimes used for quenching thirst. Source: Websters Dictionary (01 Mar 1998) |
| water willow | <botany> An American aquatic plant (Dianthera Americana) with long willowlike leaves, and spikes of small purplish flowers. Source: Websters Dictionary (01 Mar 1998) |
| water witch | <zoology> The dabchick. The stormy petrel. Source: Websters Dictionary (01 Mar 1998) |
| white-water | <veterinary> A dangerous disease of sheep. Source: Websters Dictionary (01 Mar 1998) |
| potable water | A water fit for drinking, being free from contamination and not containing a sufficient quantity of saline material to be regarded as a mineral water. (05 Mar 2000) |