Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ac-crēdo (adc.), dĭdi, dĭtum, 3, v. a. (pres. sub. adcredŭas, Plaut. Asin. 5, 2, 4), to yield one’s belief to another, i. e. to believe unconditionally (rare).