| 单词 | placoid | 
| 释义 | Word Frequency placoid(ˈplækɔɪd) adjective 1.  platelike or flattened  2.  (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity Word originC19: from Greek plac-, plax flat | 
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