able to be treated, especially medically: Some diseases are treatable but not curable.

treat + -able

treatability, noun
nontreatable, adjective
untreatable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To treatable
World English Dictionary
treat (triːt)
1.  a celebration, entertainment, gift, or feast given for or to someone and paid for by another
2.  any delightful surprise or specially pleasant occasion
3.  the act of treating
vb (usually foll by of)
4.  (tr) to deal with or regard in a certain manner: she treats school as a joke
5.  (tr) to apply treatment to: to treat a patient for malaria
6.  (tr) to subject to a process or to the application of a substance: to treat photographic film with developer
7.  (tr; often foll by to) to provide (someone) (with) as a treat: he treated the children to a trip to the zoo
8.  formal to deal (with), as in writing or speaking
9.  formal (intr) to discuss settlement; negotiate
[C13: from Old French tretier, from Latin tractāre to manage, from trahere to drag]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In their eyes, insomnia is generally caused by something treatable through
  their tool kit, usually anxiety or depression.
Though treatable with antibiotics, it can cause fatal complications if
It is easily treatable, but almost always goes undiagnosed.
Taking them instead of the real thing can turn a treatable disease into a fatal
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