Ulva

Ul"va\, n. [L., sedge.] (Bot.) A genus of thin papery bright green seaweeds including the kinds called sea lettuce.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
ulva

noun
type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for ulva
Ulva is approximately oval in shape with an indented coastline.
To ulva we came in the dark, and left it before noon the next day.
This in turn has been destroyed, and the current ulva house is on its site.
Naturally, the locals were slightly upset by this, and the minister of ulva, rev.
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