What's the difference between cetaceous and setaceous?

Cetaceous

Definition:

• (a.) Of or pertaining to the Cetacea.

Example Sentences:

Setaceous

Definition:

• (a.) Set with, or consisting of, bristles; bristly; as, a stiff, setaceous tail.
• (a.) Bristelike in form or texture; as, a setaceous feather; a setaceous leaf.

Example Sentences:

• (1) When the spheres are incubated under stationary conditions for a long time, they become setaceous and transform into coils.