Mother of pearl is an inorganic layer of some mollusk shells and has a gleam to it that makes it resemble pearls. I don't know of its use as an expression, but I'm sure there's no need to capitalize it.
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enoonIt is a euphemism for "mother of Jesus", Mary,I suspected that might be the case, but I had no experience with it as that meaning. And you're right...it does take hyphens.
PhilipMother of pearl is an inorganic layer of some mollusk shells and has a gleam to it that makes it resemble pearls. I don't know of its use as an expression, but I'm sure there's no need to capitalize it.Yeah, it's used, usually jokingly, in place of "Sweet Mother of ***." I guess if it's just a common noun, though, it wouldn't need caps.
enoonNo. Mother-of-pearl is nothing but nacre. It does take hyphens. It is a euphemism for "mother of Jesus", Mary, here.Oh, I didn't know about the hyphens; thanks for telling me that!