Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mīrĭfĭco, āre, 1, v. a. [mirificus], to exalt, make wonderful, magnify (eccl. Lat.): mirifica misericordias tuas, Vulg. Psa. 17, 7; 4, 3.