Quick Definition
I prick, pierce, stab
Strong's Definition
to prick ("nudge")
Derivation: apparently a primary word;
KJV Usage: pierce
Thayer's Greek Lexicon
νύσσω (νύττω): 1 aorist ἔνυξα; to strike (?), pierce; to pierce through, transfix; often in Homer of severe or even deadly wounds given one; as, τόν μέν ἔγχει νυξ' ... στυγερός δ' ἄρα μίν σκότος ἑιλε, Iliad 5, 45. 47; φθάσας αὐτόν ἐκεῖνος νυττει κάτωθεν ὑπό τόν βουβωνα δόρατι καί παραχρῆμα διεργάζεται, Josephus, b. j. 3, 7, 35; so τήν πλευράν λόγχη, Joh_19:34, cf. Joh_20:25; Joh_20:27. On the further use of the word cf. Fritzsche, Romans, ii., p. 559. (Compare: κατανύσσω.)
Mounce Concise Greek Dictionary
νύσσω nyssō 1x
to prick or pierce, Joh_19:34 * pierce.
Abbott-Smith Greek Lexicon
** νύσσω
( Att. . -ττω ),
[in LXX : Sir_22:19 , 3Ma_5:14 * ;]
to pierce: τ . πλευρὰν λόγχῃ , Joh_19:34 , [ Mat_27:40 ], WH .†
Moulton & Milligan — Vocabulary of the Greek NT
νύσσω [page 432]
For the ἔτυπτον . . καλάμῳ of Mar_15:19 , Ev. Petr. 3 substitutes καλάμῳ ἔνυσσον . This may perhaps be taken as supporting the milder sense of pricked instead of pierced (AV, RV) which Field ( Notes , p. 108) prefers in Joh_19:34 πλευρὰν ἔνυξεν , in distinction from ἐξεκέντησαν in ver. 37. Swete ad Ev. Petr. l.c. cites also Orac. Sib. viii 296 πλευρὰς νύξουσιν καλάμῳ .
Liddell-Scott — Intermediate Greek Lexicon
νύσσω νύσσω, "to touch with a sharp point, to prick, spur, pierce", Il. , Hes. ; ἀγκῶνι νύξας "having nudged" him with the elbow, Od. ; ν. γνώμην "to prick" it (and see what is in it), Ar.
STEPBible — Tyndale Abridged Greek Lexicon
νύσσω
(Att.. -ττω), [in LXX: Sir.22:19, 3Ma.5:14 * ;]
to pierce: τ. πλευρὰν λόγχῃ, Jhn.19:34, [Mat.27:49], WH.†
(AS)