| water adder | <zoology> The water moccasin. The common, harmless American water snake (Tropidonotus sipedon). Source: Websters Dictionary (01 Mar 1998) |
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| water agrimony | <botany> A kind of bur marigold (Bidens tripartita) found in wet places in Europe. Source: Websters Dictionary (01 Mar 1998) |
| water aloe | <botany> See Water soldier. Source: Websters Dictionary (01 Mar 1998) |
| water arum | <botany> An aroid herb (Calla palustris) having a white spathe. It is an inhabitant of the north temperate zone. Source: Websters Dictionary (01 Mar 1998) |
| water barometer | <physics> A barometer in which the changes of atmospheric pressure are indicated by the motion of a column of water instead of mercury. It requires a column of water about thirty-three feet in height. Source: Websters Dictionary (01 Mar 1998) |
| water bath | In chemistry, a vessel containing water, in which a container holding a substance to be heated or evaporated can be immersed. (05 Mar 2000) |
| water battery | 1. <physics> A voltaic battery in which the exciting fluid is water. 2. A battery nearly on a level with the water. Source: Websters Dictionary (01 Mar 1998) |
| water bear | <zoology> Any species of Tardigrada. Source: Websters Dictionary (01 Mar 1998) |
| water-bearer | <astronomy> The constellation Aquarius. Source: Websters Dictionary (01 Mar 1998) |
| water bed | A mattress in the form of a closed rubber bag filled with water; used to prevent or treat pressure sores by equalizing the distribution of the patient's weight against the support. (05 Mar 2000) |
| water beech | <botany> The American hornbeam. See Hornbeam. Source: Websters Dictionary (01 Mar 1998) |
| water bird | <zoology> Any aquatic bird; a water fowl. Source: Websters Dictionary (01 Mar 1998) |
| water blackbird | <zoology> The European water ousel, or dipper. Source: Websters Dictionary (01 Mar 1998) |
| water boatman | <zoology> A boat bug. Source: Websters Dictionary (01 Mar 1998) |
| water brain | A disease of sheep; gid. Source: Websters Dictionary (01 Mar 1998) |