单词 | echinoid |
释义 | echinoid/ˈɛkɪnɔɪd /Zoology noun An echinoderm of the class Echinoidea; a sea urchin.Fossils include foraminiferans, brachiopods, echinoids, pelecypods, cephalopods, shark teeth, fish vertebrae, as well as asteroids, gastropods, a pterosaur, a nodosaurid, and decapods....
adjective Relating to or denoting echinoids.Seven horizons of echinoid aggregations, totaling approximately 3 % of the channel thickness, occur in the black shale....
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