Lexical Definition

‎ἅρπαξ‎ hárpax (har'-pax) rapacious G:A
from ‎ἁρπάζω‎

extortion, ravening.

Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
ἅρπαξιν with swindlers 1Cor.5.10
ἅρπαξ swindler 1Cor.5.11
ἅρπαγεσ ravenous Matt.7.15
swindlers Luke.18.111Cor.6.10
άρπαξ a predacious LXX.Gen.49.27

Abbott-Smith

ἅρπαξ, -αγος, ὁ, ἡ (< ἁρπάζω), [in LXX: Ge 49:27 (טרף)*;]
rapacious: Mt 7:15, Lk 18:11; as subst., a swindler, an extortioner (MM, s.v.), I Co 5:10, 11 6:10.†

Abbott-Smith References

Book Refs
Genesis 49:27
Matthew 7:15
Luke 18:11
1 Corinthians 5:10 · 5:11 · 6:10

Liddell-Scott-Jones

ἅρπαξ, ᾰγος, , ,

(ἁρπάζω) robbing, rapacious, [Refs 5th c.BC+]: also with substantive neuter, ἅρπαγι χείλει[Refs]: superlative ἁρπαγίστατος[Refs 5th c.BC+]

__II mostly as substantive,
__II.1 ἅρπαξ, , rapine, [Refs 8th c.BC+]
__II.2 ἅρπαξ, , robber, peculator, τῶν δημοσίων[Refs 5th c.BC+]; πάντες εἰσὶν ἅρπαγες (i.e. οἱ Ὠρώπιοι) [Refs]
__II.3 species of wolf, [Refs 3rd c.AD+]
__II.4 grappling-iron, used in sea-fights, [Refs 4th c.BC+]; flesh-hook, [Refs 1st c.AD+]