adj. Incurable; not able to be assisted by medicine.
the GNU version of the Collaborative International Dictionary of English
adj. Not to be healed; incurable.
The Century Dictionary and Cyclopedia
Not amenable to medicine; incapable of being healed; incurable.
Word Usage
"In the south, the disease, virulent and immedicable, had nearly annihilated the race of man; storm and inundation, poisonous winds and blights, filled up the measure of suffering."