Definify.com

Webster 1913 Edition

Noun.

One who, or that which, mollifies.

Bacon.

Noun.

That which softens, appeases or mitigates.

He that softens, mitigates or pacifies.

mollifier ‎(plural mollifiers)

(mathematics) An "approximation to the identity", a smooth function with special properties, used in distribution theory to create sequences of smooth functions approximating nonsmooth (generalized) functions, via convolution.
- 2009, Notices of the American Mathematical Society, volume 56, number 6:
  I particularly remember how, at that time, I was using his mollifier method to study the zero density of L-functions and was stuck with something.