pal ‧ li ‧ ate /ˈpælieɪt/ BrE AmE verb [transitive] formal
[ Date: 1400-1500 ; Language: Late Latin ; Origin: past participle of palliare 'to cover, hide' , from Latin pallium ; ⇨ ↑ pall 2 ]
to reduce the effects of illness, pain etc without curing them:
Chosen carefully, the oils may not only palliate but also cure the condition.