noun
: a pearly excrescence on the inside of the shell of a mollusk (as the oyster) commonly enclosing a foreign body (as a bit of mud or a parasite)
noun
: a pearly excrescence on the inside of the shell of a mollusk (as the oyster) commonly enclosing a foreign body (as a bit of mud or a parasite)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012