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]. 1859 Page Geol. Terms. |