Lexical Definition

‎κῆρυξ‎ kēryx (kay'-roox) preacher ^G:N-M
from ‎κηρύσσω‎

preacher.

• a herald, i.e. of divine truth (especially of the gospel)

Abbott-Smith

κῆρυξ (κήρ-, T), -υκος, ὁ, [in LXX: Da LXX TH 3:4 (כָּרוֹז), Ge 41:43, Si 20:15, IV Mac 6:4*;]
a herald: I Ti 2:7, II Ti 1:11, II Pe 2:5.†

Abbott-Smith References

Liddell-Scott-Jones

κῆρυξ, ῡκος, ὁ,

Aeolic dialect κᾶρυξ [ᾱ] [Refs 7th c.BC+]:—but κήρῡκος, ου, ὁ, [Refs]: (κηρύσσω):— herald, pursuivant: generally, public messenger, envoy, κ. λιγύφθογγοι [Refs 8th c.BC+]; θεῶν κ., of Hermes, [Refs 8th c.BC+], as being messengers between nations at war, [Refs 5th c.BC+]: as proper name of a family at Athens, [Refs 5th c.BC+]

__b as feminine, [Refs 5th c.BC+]
__2 crier, who made proclamation and kept order in assemblies, etc., [Refs 5th c.BC+]; ὁ τῶν μυστῶν κ., at Eleusis, [Refs 5th c.BC+]
__3 auctioneer, ὑπὸ κήρυκος πωλεῖν [Refs 4th c.BC+]; ἀποδίδοσθαι ὑπὸ κήρυκι [Refs 1st c.AD+]
__4 generally, messenger, herald, θεοὶ κήρυκες ἀγγέλλουσι [Refs 5th c.BC+]; of the cock, [Refs 5th c.BC+]; of writing, [Refs]; of Homer, ἡρώων κάρυκ᾽ ἀρετᾶς [NT]
__II trumpet-shell, e.g. Triton nodiferum, and smaller species, [Refs 5th c.BC+]. [ῡ except accusative plural κήρῠκας [κῆρυξ, Hdn.Gr. 1.44 ">Refs 5th c.BC+], etc.] (Cf. Sanskrit kārús 'poet', kīrtis 'fame'.)

_{LSJ Scripture Refs: 1Tim.2.7}