Definition of Preboreal in English:

Preboreal

Syllabification: Pre·bo·re·al
Pronunciation: /prēˈbôrēəl
 
/

adjective

Geology
1Of, 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.
1.1 (as noun the Preboreal) The Preboreal climatic stage.

Definition of Preboreal in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose