Yikes! another appeal to the Greeks!

Maybe someone can post the pistikos entry from other lexicons for comparison. Draw your conclusions. 

πιστικός, 3   pistikos   faithful; genuine(?)*

According to Mark 14:3 and John 12:3 the vessel for anointing Jesus contained (costly) nard ointment (μύρου νάρδου). The adj. πιστικός, modifying νάρδος, probably means here genuine, unadulterated (Spicq, Notes II, 696: “a perfume of genuine nard” or “extremely pure nard”). Possibly, however, πιστικός derives from a name (Theophylact, PG CXXIII, 645B; cf. John 12:3 Vg.: pisticus). BAGD s.v. 3; Spicq, Notes II, 695f.

Balz, H. R., & Schneider, G. (1990-). Vol. 3: Exegetical dictionary of the New Testament (91). Grand Rapids, Mich.: Eerdmans.

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πιστικός, ή, όν (πίστις; since Pla., Gorg. 455a) only as modifying νάρδος, w. πολυτελής or πολύτιμος Mk 14:3; J 12:3; variously interpreted, but evidently suggesting exceptional quality.

① genuine, unadulterated. In later writers π. means that which belongs to πίστις, ‘faithful, trustworthy’ (Artem. 2, 32; Vett. Val. p. 10, 14; pap ‘trusted pers.’; Celsus 1, 39 λόγος πιστικός). Fr. this basis π. has become interpreted to mean genuine, unadulterated (Eus., Dem. Ev. 9, 8, 9 τοῦ πιστικοῦ τῆς καινῆς διαθήκης κράματος. Given as a possibility by Theophyl. Sim., s. 3 below. See B-D-F §113, 2; Mlt-H. 379f).

② The derivation fr. πίνω (so L-S-J-M), w. the sense drinkable, liquid, is very improbable (Frisk II 541).

③ Some derive π. from a name of some kind (Theophyl. Sim. [MPG CXXIII 645b] πιστικὴν νάρδον νοεῖ ἤτοι εἶδος νάρδου οὕτω λεγόμενον πιστικὴν ἢ τὴν ἄδολον νάρδον); e.g. the Gk. form of the Lat. spicatum (Galen XII 604 K. τὰ πολυτελῆ μύρα τῶν πλουσίων γυναικῶν ἃ καλοῦσιν αὗται σπίκατα other reff. Wetstein on Mk 14:3.—EbNestle, ZNW 3, 1902, 169ff), or fr. πιστάκια ‘pistachio tree’ (AMerx on Mk 14:3; MBlack, An Aramaic Approach3, ’67, 223–25) or the East-Indian picƷita, the name of the plant Nardostachys Jatamansi.—UvWilamowitz, Reden u. Vorträge2 1902, 204; AJannaris, ClR 16, 1902, 9; RKöbert, Biblica 29, ’48, 279–81. W-S. §16, 3b note 24. S. also νάρδος.—DELG s.v. πείθομαι. M.M. Spicq.

Arndt, W., Danker, F. W., & Bauer, W. (2000). A Greek-English lexicon of the New Testament and other early Christian literature (3rd ed.) (818). Chicago: University of Chicago Press.

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SPIKENARD  

nardos (νάρδος, 3487), is derived, through the Semitic languages (Heb. nerd, Syriac nardin), from the Sanskrit nalada, “a fragrant oil,” procured from the stem of an Indian plant. The Arabs call it the “Indian spike.” The adjective pistikos is attached to it in the NT, Mark 14:3; John 12:3; pistikos, if taken as an ordinary Greek word, would signify “genuine.” There is evidence, however, that it was regarded as a technical term. It has been suggested that the original reading was pistakes, i.e., the Pistacia Terebinthus, which grows in Cyprus, Syria, Palestine, etc., and yields a resin of very fragrant odor, and in such inconsiderable quantities as to be very costly. “Nard was frequently mixed with aromatic ingredients … so when scented with the fragrant resin of the pistake it would quite well be called nardos pistakes” (E. N. Bennett, in the Classical Review for 1890, Vol. iv, p. 319). The oil used for the anointing of the Lord’s head was worth about L/12, and must have been of the most valuable kind.¶ In the Sept., Song of Sol. 1:12; 4:13, 14.¶  

Vine, W. E., Unger, M. F., & White, W. (1996). Vol. 2: Vine's Complete Expository Dictionary of Old and New Testament Words (593). Nashville, TN: T. Nelson.

Keep Smiling [:)]