| 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) |
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| 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) |
| hard water | <chemistry> Hard water is water which contains minerals like calcium carbonate, magnesium carbonate, bicarbonates, sulphates, or chlorides, because it has been exposed to rocks or rocky soils. Hard water can corrode, discolour, or deposit its minerals, in and around materials such as water pipes. (09 Oct 1997) |
| heavy water | most commonly used by cell biologists to stabilise microtubules. (18 Nov 1997) |