Ameliorating

ppl. a. [f. as prec. + -ING².] Improving, making better.

1767.  A. Young, Farmer’s Lett., 112. Sow oats after a fallow or some ameliorating crop.

1864.  Gladstone, in Daily Tel., 12 Oct. Any man who proposes an ameliorating law becomes … a sort of object of suspicion.