Assertion: oyster's shell | /r/HasProperty | rounded
Facets:
Source sentences:
text: The dingy white shell, which is thick and rounded and has prominent concentric lines, is found in the intertidal zone from the Gulf of St. Lawrence to the Gulf of Mexico; it is the most important food clam of the Atlantic coast.
text: The shell can be rounded or elongated and is white to purplish black and may be striped with yellow or brown.