Lexical Definition

‎στίλβω‎ stílbō (stil'-bo) to shine ^G:V
apparently a primary verb

shining.

• to gleam, i.e. flash intensely

Abbott-Smith

στίλβω [in LXX: Na 3:3 (לַהַב), etc. ;]
to shine, glisten: Mk 9:3.†

Abbott-Smith References

Liddell-Scott-Jones

στίλβω-ω,

chiefly present and imperfect: aorist ἔστιλψα [Refs 2nd c.AD+]:—glitter, gleam, of polished or bright surfaces, χιτῶνας.. ἦκα στίλβωοντας ἐλαίῳ [στίλβωων καὶ εἵμασιν 3.392; κάλλεϊ καὶ χάρισι στίλβωων 8th c.BC: Odyssea Homerus Epicus “Odyssey” 6.237 ">Refs 8th c.BC+]; λαμπραὶ δ᾽ ἀκτῖνες ἀπ᾽ αὐτοῦ αἰγλῆεν στίλβωουσι beam from him, [στίλβωειν ἄτο.. φλόγα 5th c.BC: Bacchylides Lyricus 17.55 ">Refs 5th c.BC+]; σ. ὅπλοις [Refs 5th c.BC+]; ἰδὼν στίλβωοντα τὰ λάβδα, i.e. the λ upon the Spartan shields, [στίλβωοντα NT.Mark.9.3: \_absolutely\_, of gold, 5th-6th c.BC: Plato Philosophus “Timaeus” 59b ">NT+5th c.BC+]; of sleek horses, σ. ὥστε κύκνου πτερόν [Refs 5th c.BC+]; of brilliant complexion, [Refs 3rd c.BC+]; of water in motion, [Refs 4th c.BC+]; of the white gleam on the eye, [στίλβωοντι 4th-3rd c.BC: Theophrastus Philosophus “de Sensu” 26 ">Refs 4th c.BC+]; of fixed stars, opposed to planets (exc. Mercury, see at {στίλβωων}), twinkle, [Refs 4th c.BC+] flash lightning, [Refs 5th c.BC+]

__2 metaphorically, shine, be bright, [Refs 5th c.BC+]
__II transitive,= στιλπνόω, στίλβωει πρόσωπον [Refs 1st c.AD+]

_{LSJ Scripture Refs: Mark.9.3}