palliative

Short definition from Wiktionary

Adjective

1. 1
   Serving to palliate; serving to extenuate or mitigate.
2. 2
   Minimising the progression of a disease and relieving undesirable symptoms for as long as possible, rather than attempting to cure the (usually incurable) disease.

Noun

1. 1
   Something that palliates, particularly a palliative medicine.