gromwell /gromˈwəl/

1. Any plant of the genus Lithospermum, of the borage family, with smooth, stonelike seeds formerly used medicinally
2. The oyster plant (genus Mertensia), also of the borage family

• opah
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• opal glass
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• opaline
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• opaqued
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• opaquer
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• op art
• op cit