The extent to which a free wave propagated in a medium bends round any object or is Diffracted depends on the relation between the length of the wave and the size of the object.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
For he bore at the very top of it the seal and stamp of his patent-the manifest impact of a bullet, Diffracted by the power of Pong.
"Springhaven A Tale of the Great War"
R. D. Blackmore
As I remember, the color of the sky is due to the scattering of light-light rays being Diffracted in the air.
"The Sky Is Falling"
Lester del Rey