Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praestī̆gĭae, ārum (rare in the sing.; praestigiae, Prud. Peristeph. 2, 86), f. [praestinguo], deceptions, illusions, jugglers’ tricks, sleights, feats of legerdemain; lit. and trop. (class.; cf. captio): patent praestigiae, Plaut. Capt. 3, 3, 9: verborum, deceptive use of words, Cic. Fin. 4, 27, 74: quasi praestigiis quibusdam et captionibus depelli, id. Ac. 2, 14, 45: omnes meos dolos, fallacias, Praestigias praestrinxit commoditas patris, Caecil. ap. Cic. N. D. 3, 29, 73 (Com. Rel. p. 59 Rib.): non per praestigias, sed palam compilare, by stratagem, secretly, Cic. Verr. 2, 4, 24, § 53; Liv. 6, 15 fin.: Graecae istorum praestigiae philosophari sese dicentium, Gell. 13, 23, 2: nubium, the deceptive images formed by the clouds, App. de Mundo, p. 23, 32.
In sing.: praestigiae plausum petere, Quint. 4, 1, 77; so Tert. adv. Marc. 3, 24 fin.
praestigĭum, ii, n., a delusion, illusion, trick: Γοητεία, praestigium, Gloss. ad Prud. Onom. Vet.: praestigiis absolvi, Amm. 14, 11, 23.