| 单词 | placoid |
| 释义 | placoid adj. & n. --adj 1. (of a fish-scale) consisting of a hard base embedded in the skin and a spiny backward projection (cf. CTENOID). 2. (of a fish) covered with these scales. --n a placoid fish, e.g. a shark. Etymology: Gk plax plakos flat plate |
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