Lenîmen, pen. prod. leníminis, n. g. Ouid.That maketh pleasant, or stueete: that taketh away the sharpenesse or tartnesse: that maketh lesse grieuons.Dulce lenimen laborum. Horat.
Lewis and Short: Latin dictionary
lēnīmen, ĭnis, n. [lenio], a softening or soothing remedy; an alleviation, mitigation, solace (poet.): testudo laborum Dulce lenimen, Hor. C. 1, 32, 14: sollicitae lenimen dulce senectae, Ov. M. 6, 500: addidit illis hoc quoque lenimen, id. ib. 11, 450.