Merriam-Webster's Collegiate® Dictionary, 11th Edition
SATIN
I. noun
Etymology: Middle English, from Anglo-French, probably from Arabic zaytūnī, literally, of Zaytūn, seaport in China during the Middle Ages
Date: 14th century
a fabric (as of silk) in satin weave with lustrous face and dull back,
II. adjective
Date: 15th century
made of or covered with satin, suggestive of satin especially in smooth lustrous appearance or sleekness to touch