Rayon n. : Ray; beam.

Example:
How do you patch a hole in Rayon?

Taxonomy
rayon, viscose, cellulose, fibers, crumb, viscose rayon, HWM rayon, filaments, cellulose acetate, texture, rayon fiber, Biodegradability, textiles, Rayon fabrics, Rayon fibers, free encyclopedia, synthetic fiber, History.

Defination from the web:
Rayon is a manufactured regenerated cellulose fiber. ... The commercial production started 1891, but it was flammable, and more expensive than acetate or cuprammonium rayon. ... The first commercial viscose rayon was produced by the UK company Courtaulds Fibers in 1905. ...