Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word percalluisse could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
per-calleo, ŭi, ēre, v. a., to know or understand well: quinque et viginti gentium linguas, Gell. 17, 17, 2.
per-callesco, callŭi, 3, v. inch. n. and a.