单词 | protostele |
释义 | Word Frequency protostele(ˈprəʊtəˌstiːl, -ˌstiːlɪ) noun botany a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc Derived forms protostelic (ˌprotoˈstelic) adjective |
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