Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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cultured pearl a pearl formed by an oyster or mussel around an irritant such as a seed pearl inserted in its body under controlled conditions.
mother-of-pearl the glossy hard iridescent substance that forms the inner surface of some shells and is commonly used in jewelry and inlaid decoration.
pearl ash a white powdery substance used to manufacture soap, glass, and the like; potassium carbonate.
pearl gray a pale bluish gray color.
seed pearl a very small, often imperfect pearl, weighing less than one quarter of a gram.