nou·me·non 
(nmə-nŏn′)
(nmə-nŏn′)n. pl. nou·me·na (-nə)
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.
[German, from Greek nooumenon, from neuter present passive participle of noein, to perceive by thought, from nous, mind.]
noumen·al (-mə-nəl) adj.