0 a delicate, soft type of cloth made from a thread produced by silkworms, or the thread itself:
2 a QC : a lawyer of high rank in some countries
3 a smooth, shiny cloth made from a thread produced by a type of caterpillar (= small, tube-shaped insect), or the thread itself:
a silk shirt
She wore a dress of crimson silk to the dinner and was the belle of the ball.
Satin and silk are "mid-sheen" finishes, which means they look like a slightly polished surface and reflect a bit of light.
Emulsion paint is fine, white for ceilings and a pale silk finish for walls.