Preboreal
/priːˈbɔːrɪəl/adjective
1- Geology of, relating to, or denoting the first climatic stage of the postglacial period in northern Europe, between the Younger Dryas and Boreal stages (about 10,000 to 9,000 years ago). The stage was marked by a rapid spread of birch and pine forests.【地质】（与）前北方期（有关）的（北欧冰后期的第一个气候期, 居于新仙女木期和北方期之间［约10,000到9,000年前］; 该时期桦树和松树迅速蔓延）。
1.1
- as noun the Preboreal the Preboreal climatic stage前北方气候期。