IPA: /ˈhiːləbl/
KK: /ˈhiːləbl/
Able to be treated or cured, especially in a medical context.
The doctor assured her that her injury was healable with proper care.
Healable is formed from "heal" (from Old English "hælan", meaning to make whole or to cure) and "-able" (meaning capable of). The word "healable" means capable of being healed or cured.
Think of the word 'heal' which means to make whole, and remember that 'healable' refers to something that can be made whole or cured.