| 单词 | prismatic layer |
| 释义 | > as lemmasprismatic layer prismatic layer n. Conchology (in a mollusc shell) a layer consisting of vertical columnar crystals of calcite or aragonite, lying below the periostracum and above the lamellate layer. ΚΠ 1833 J. E. Gray in Philos. Trans. (Royal Soc.) 123 795 In the upper valve of Ostrea cornucopiæ, I have observed the thick inner layer to be rather prismatic, and the outer part of the laminæ to be separated by layers of periostracum.] 1871 Proc. Amer. Philos. Soc. 1869–70 11 188 The distinct natures of the lamellar and prismatic layers have been evidently well understood by the artificer, who has ground away the latter in order to put a sharp edge on the former at one end. 1958 J. E. Morton Molluscs iii. 49 The mantle edge consists of three lobes... The outer lobe (I) secretes the outer calcareous (prismatic) layer of the shell. 1991 R. Goldring Fossils in Field iv. 80 Compaction will have generally closed the chalk about the prismatic layer so that all trace of internal marking and muscle impressions is lost. < as lemmas |
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