Mollifier

Wiktionary Word definitions in Wiktionary
a. Tending to mitigate. n. Something that mitigates; a lenitive.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Mitigant \Mit"i*gant\, a. [L. mitigans, p. pr. of mitigare. See Mitigate .] Tending to mitigate; mitigating; lenitive. --Johnson.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1540s, from Latin mitigantem , present participle of mitigare (see mitigate ). As a noun from 1865.