1. [n]  a member of a people who inhabited ancient Sumer
2. [adj]  of or relating to ancient Sumer or its inhabitants

SUMERIAN is a 8 letter word that starts with S.

1. \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.
   
   

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