noun (n)

• a covering of coarse fabric (usually of straw or hemp)(noun.artifact)

  source: wordnet30
• mounting consisting of a border or background for a picture(noun.artifact)

  Synonym:
  mat
  

  source: wordnet30
• The act of interweaving or tangling together so as to make a mat; the process of becoming matted.(noun)

  source: webster1913
• A dull, lusterless surface in certain of the arts, as gilding, metal work, glassmaking, etc.(noun)

  source: webster1913