Water seal
noun
1.
a small amount of water contained in the trap of a drain to prevent the passage of foul smells
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- Water-shamrock
noun 1. water clover. water clover noun 1. a common freshwater fern, Marsilea quadrifolia, of lake edges and quiet ponds, having roots embedded in the bottom, very slender and often tangled stems, and floating, cloverlike leaves composed of four leaflets.
- Watershed
noun 1. Chiefly British. the ridge or crest line dividing two drainage areas; water parting; divide. 2. the region or area drained by a river, stream, etc.; drainage area. 3. Architecture. wash (def 44). 4. an important point of division or transition between two phases, conditions, etc.: The treaty to ban war in space may […]
- Watershed infarction
watershed infarction n. Infarction of the cerebral cortex in an area of blood supply between two major cerebral arteries.
- Water-shield
noun 1. Also called water target. an aquatic plant, Brasenia schreberi, of the water lily family, having purple flowers, floating, elliptic leaves, and a jellylike coating on the underwater stems and roots. 2. a fanwort, especially Cabomba caroliniana. water shield noun 1. a North American nymphaeaceous plant, Brasenia schreberi, with floating oval leaves and purple […]
- Water shrew
noun 1. either of two small amphibious shrews, Neomys fodiens (European water shrew) or N. anomalus (Mediterranean water shrew), having a dark pelage with paler underparts