from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of obscure or unknown origin. Used of diseases.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of uncertain origin, either introduced or native to its area.
- adj. Presumed but not proven to be caused by an abnormality in a particular part of the brain (contrasts with symptomatic and idiopathic).
- adj. Of uncertain cause.
from The Century Dictionary and Cyclopedia
- Same as cryptogenetic.
From crypto- + -genic. (Wiktionary)