| total body water | The sum of intracellular water and extracellular water (volume). About 60% of body weight. (05 Mar 2000) |
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| transcellular water | That fraction of extracellular water in cerebrospinal, digestive, epithelial, introcular, pleural, sweat, and synovial secretions; about 1.5% of body weight. (05 Mar 2000) |
| extravascular lung water | <physiology> Water present within the lungs; its volume is roughly equal to, or a little less than, the intracellular blood volume of the lungs. Accumulations of extravascular lung water result in pulmonary oedema. (12 Dec 1998) |
| free water | Water in the body that can be removed by ultrafiltration and in which substances can be dissolved. (05 Mar 2000) |
| free water clearance | The amount of water excreted in the urine beyond that which would accompany the excreted solutes if the urine were isosmotic with plasma; it represents the loss of body water in excess of solute tending to raise body osmolality and making urine hyposmotic. Unlike other clearance's, it is calculated by subtracting the osmolal clearance from the actual volume of urine excreted per minute. A negative value for free water clearance represents the amount of water that the body has reclaimed from isosmotic tubule fluid to make the urine hyperosmotic and to lower body osmolality. (05 Mar 2000) |
| fresh water | 1. Water containing no significant amounts of salts, such as rivers and lakes. 2. Of, pertaining to, or living in, water not salt; as, fresh-water geological deposits; a fresh water fish; fresh water mussels. 3. Accustomed to sail on fresh water only; unskilled as a seaman; as, a fresh water sailor. 4. Unskilled; raw. Fresh water soldiers. Source: Websters Dictionary (01 Mar 1998) |
| light water | <radiobiology> Ordinary H2O, as opposed to heavy water, which contains atoms of the heavier isotopes of hydrogen, deuterium and/or tritium. See: hydrogen, isotope, deuterium, tritium, heavy water. (09 Oct 1997) |
| light-water reactor | <radiobiology> Class of fission reactors using ordinary light water as a coolant, rather than liquid metal or heavy water (water with deuterium instead of hydrogen). (09 Oct 1997) |
| lime water | Calcium hydroxide solution; a saturated solution prepared by mixing 3 g of calcium hydroxide in a liter of purified cool water. Undissolved calcium hydroxide is allowed to precipitate and the solution is dispensed without agitation; lime water is a common ingredient in lotions and is used internally extensively in veterinary medicine. (05 Mar 2000) |
| littoral water | Shallow water, to 30 feet, near the shore of deep lakes. (09 Oct 1997) |