D defs.my
Entry 1 sense Webster, 1913

Pleistocene

/plīs'-təs-ēnˌ/ · Pleis·to·cene · IPA /ˈplaɪstəˌsiːn/
01 a. Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man.
  1. 1.
    Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man.(Geol.)