[Vocabulary] rank

[rock-onn]

These appearances, which bewilder you, are merely electrical phenomena not uncommon--or it may be that they have their ghastly origin in the rank miasma of the tarn.

What is the meaning of 'rank' here?
Thanks for your support.

 

[Rover_KE]

Tell us the source and author, please.

rank = foul-smelling

 

[rock-onn]

I was referring to thefreedictionary.com for the meaning of miasma. That webpage also gives reference from classic literature. Its source is as below.

http://poe.thefreelibrary.com/Fall-of-the-House-of-Usher/1-1#miasma