| 释义 |
hem·era
\ˈhemərə\ noun
(plural hemerae \-ə(ˌ)rē\ ; also hemera)
Etymology: New Latin, from Greek hēmera day; akin to Greek ēmar day, Armenian aur
1. : a stratigraphic zone comprising the time range of a particular fossil species
2. : a period of time during which a race of organisms is at the apex of its evolution |