is an adjective used primarily in medicine meaning arising spontaneously or from an obscure or unknown cause.
idiopathic
a yellowish pigmentation of the skin, tissues, and certain body fluids
jaundice
having a tendency to loosen or relax, relieving constipation; drug inducing defecation
laxative
a cell of the tissues comparable to or derived from a leukocyte; white blood cell
leukocyte
A condition characterized by brief attacks of deep sleep
narcolepsy
A new growth of tissue serving no physiological function
neoplasm