Source : Webster's Revised Unabridged Dictionary (1913)

Sumerian \Su*me"ri*an\, a. [Written also {Sumirian}.]
   Of or pertaining to the region of lower Babylonia, which was
   anciently called Sumer, or its inhabitants or their language.

Sumerian \Su*me"ri*an\, n. [Written also {Sumirian}.]
   A native of lower Babylonia, anciently called Sumer.