Noumenon: The antonym for phenomenon?

[dekoi]

Is it 'noumenon'?

...in the philosophy of Immanuel Kant, the thing-in-itself (das Ding an sich) as opposed to what Kant called the phenomenon—the thing as it appears to an observer. Though the noumenal holds the contents of the intelligible world, Kant claimed that man's speculative reason can only know phenomena and can never penetrate to the noumenon.

Is my understanding correct?

Please feel free to delete this thread after it has been answered (if you feel it serves little purpose) .

 

[Evo]

I've only seen the word used in relation to Kant. Perhaps he made it up?

Here is the dictionary.com definition

In the philosophy of Kant, an object as it is in itself independent of the mind, as opposed to a phenomenon. Also called thing-in-itself.

 

[Ivan Seeking]

It strikes me as more antithetical [to phenomenon] than an antonym.

http://www.onelook.com/?w=noumenon&ls=a

 

[Chrono]

Also called thing-in-itself.

Sounds like Sartre there.