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| ne·phrid·i·um [ nə fríddee əm ] (plural ne·phrid·i·a [ nə fríddee ə ]) |
noun |
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1. excretory organ: a simple tube-shaped organ in earthworms and many other invertebrate organisms for releasing waste matter into the gut or out of the body
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2. embryonic kidney: the organ that develops into the kidney in the embryo of a vertebrate animal
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| [Late 19th century. <nephro- + modern Latin -idium "small one" (< Greek -idion)] |
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 ne·phrid·i·al adjective |
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