| 单词 | placoidal |
| 释义 | > as lemmasplaˈcoidal plaˈcoidal adj. rare = sense A. 1a. ΘΚΠ the world > animals > fish > subclass Elasmobranchii > [adjective] > of or relating to Placoidei placoidean1836 placoid1842 placoidal1845 1845 R. Chambers Vestiges Nat. Hist. Creation (ed. 3) 207 When fishes came, the first forms were those ganoidal and placoidal types which correspond with the early fœtal condition of higher orders. 1940 Q. Rev. Biol. 15 75/2 Differences in the origin and development and distribution of mantle dentin and circumpulpar dentin are shown for the placoidal organs and the various types of teeth of several species of sharks and rays. < as lemmas |
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