1938, coined, according to DuPont, from a random generic syllable nyl- + -on, a common ending in fiber names (compare rayon and later Dacron), said to be ultimately from cotton. "Consumer Reports" in 1939 called it "duPont's much-publicised new miracle yarn, which is scheduled to appear in 5,000,000 stockings next year and which is meantime giving rise to many rumors, hopes and fears." As an adjective from 1939. Nylons for "nylon stockings" is from 1940.
Nylon is the generic name chosen by the Dupont Company for a group of materials classed as synthetic linear superpolymers. It has also been defined as a "Man made protein-like chemical product (polyamide) which may be formed into fibers, bristles, sheets, and other forms, characterized when drawn by extreme toughness, elasticity, and strength." ["The Michigan Technic," August 1945]
polyethylene terephthalate used as a textile fabric, 1951, proprietary name coined by E.I. du Pont de Nemours & Co.; an invented word of no etymology, on the model of nylon, etc.
1958, proprietary name (Britain), from French vel(ours) cro(ché) "hooked velvet."
Here is a nonmetallic fastener with no mechanical parts. It is simply two strips of nylon, one woven with thousands of tiny protruding hooks, the other with loops. Pressed together, they catch like a burr to clothing, can't be parted except by peeling. American Velcro, Manchester, N.H., makes them to hold anything from pants to upholstery. [Popular Science, December 1958]