单词 | echinoderm |
释义 | Word Frequency echinoderm(ɪˈkaɪnəʊˌdɜːm) noun any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers Derived forms echinodermal (eˌchinoˈdermal) or echinodermatous (eˌchinoˈdermatous) adjective |
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