Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praestigĭum, ii, n., a delusion, illusion, trick: Γοητεία, praestigium, Gloss. ad Prud. Onom. Vet.: praestigiis absolvi, Amm. 14, 11, 23.