Contemper

Con*tem"per (kŏn*tĕm"pẽr), v. t. [L. contemperare, - temperatum; con- + temperare to temper. Cf. Contemperate.] To modify or temper; to allay; to qualify; to moderate; to soften. [Obs.]

The antidotes . . . have allayed its bitterness and contempered its malignancy.
Johnson.