| 单词 | protonephridium |
| 释义 | protonephridium in American English (ˌproʊtoʊniˈfrɪdiəm; ˌproʊtoʊnəˈfrɪdiəm) noun Zoology a tubular, excretory structure in certain invertebrates, as flatworms, rotifers, and some larvae, usually ending internally in flame cells and having an external pore Word origin proto- + nephridium |
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