water shield

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.
a fanwort, especially Cabomba caroliniana.


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World English Dictionary
water shield
1.  a North American nymphaeaceous plant, Brasenia schreberi, with floating oval leaves and purple flowers
2.  any of several similar and related plants of the genus Cabomba

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica

water shield

(Brasenia schreberi), small purple-flowered aquatic plant of the fanwort family (Cabombaceae), found in northern ponds and still waters throughout the world, except in Europe. "Water shield" also refers to fanwort (Cabomba).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The shores of the pond are densely matted with floating leaves of cow lily, water shield, and pondweed.
The use of a thin, self-sticking rubber ice and water shield under flashings and on the edge of roofs is now common practice.
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