Definition of Preglacial

Babylon English Dictionary
prior to the Ice Age, occurring before the Ice Age
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Preglacial Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
Prior to the glacial or drift period.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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preglacial
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preglacial
\pre*gla"cial\ (?), a. (geol.) prior to the glacial or drift period.