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单词 premeridian
释义 premeridian, a.|priːməˈrɪdɪən|
[pre- B. 1 a.]
Occurring before noon; in Geol., applied by H. D. Rogers to the seventh of his fifteen subdivisions of the Palæozoic strata of the Appalachian chain.
1858[see postmeridian a. 2].1859Page Geol. Terms.
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