Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
terrĭfĭco, āre, v. a. [terrificus], to make afraid, to frighten, alarm, terrify (poet. and very rare), Lucr. 1, 134: caecique in nubibus ignes Terrificant animos, Verg. A. 4, 210: viros, Stat. Th. 7, 678.