matting (n.1)youdaoicibaDictYouDict[matting 词源字典]
"process of making mats," 1720, from mat (n.1). Meaning "coarse fabric for mats" is from 1748.[matting etymology, matting origin, 英语词源]
matting (n.2)youdaoicibaDictYouDict
"ornamental border of a picture," 1864 from verbal derivative of mat (n.2).