from the GNU version of the Collaborative International Dictionary of English
- n. a marine bivalve shell (Placuna placenta) native of the East Indies and China. Its valves are very broad, thin, and translucent, and are said to have been used formerly in place of glass.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. marine bivalve common in Philippine coastal waters characterized by a large thin flat translucent shell
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