stadial

adjective
sta·​di·​al | \ ˈstādēəl\

Definition of stadial

 (Entry 1 of 2)

: of or relating to a stage, stadial, or stadium

stadial

noun
\ "\
plural -s

Definition of stadial (Entry 2 of 2)

: a substage of a glacial stage especially : one marked by a readvance of ice

History and Etymology for stadial

Adjective

stadium + -al

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