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| pro·neph·ros [ prō néffrəss, prō né fròss ] (plural pro·neph·roi [ prō né fròy ] or pro·neph·ra [ prō néffrə ]) |
noun |
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| Definition: |
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embryonic part of kidney: the first of three segments of the kidney, functional in some vertebrate embryos but not in adults
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| [Late 19th century. <pro-2 + Greek nephros "kidney"] |
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 pro·neph·ric adjective |
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