Lexical Definition

‎θανατήφορος‎ thanatḗphoros (than-at-ay'-for-os) deadly ^G:A
from (the feminine form of) ‎θάνατος‎ and ‎φέρω‎

deadly.

• death-bearing, i.e. fatal

Abbott-Smith

θανατη-φόρος, -ον (< θάνατος, φέρω), [in LXX: Nu 18:22 (מוּת), Jb 33:23, IV Mac 8:18, 26 15:26*;]
deadly, death-bringing: Ja 3:8.†

Abbott-Smith References

Liddell-Scott-Jones

θανατήφορος-ος, ον,

death-bringing, αἶσα [Refs 4th c.BC+]; περίοδος θ. cycle of mortality, [Refs 5th c.BC+]; of hurts or accidents, [Refs 5th c.BC+]; of a surgical operation, [Refs 2nd c.AD+]; ῥίζα ἐν Αἰθιοπία, of arrow-poison, Acokanthera Schimperi, [Refs 4th c.BC+]; γένεθλα.. θ. κεῖται causing death by contagion, [Refs 5th c.BC+]; πᾶσαι μεταβολαὶ πολιτειῶν θ. [LXX+5th c.BC+]; δίκαι capital trials, [Refs 2nd c.AD+]. adverb -ρως, νοσεῖν [Refs 1st c.BC+]: neuter singular as adverb, ἐπλήγη οὐχὶ -φόρον [Refs 4th c.BC+]; but -φόρον ᾄδειν to sing a death song, [Refs 1st c.AD+]

_{LSJ Scripture Refs: LXX.Num.18.22}