Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-cortĭco, no perf., ātum, 1, v. a. [cortex], to deprive of the bark: to bark, to peel (rare), Plin. 16, 39, 74, § 188: abietem, id. 16, 41, 80, § 221: ficum, Vulg. Joel 1, 7.