Lexical Definition

‎μυελός‎ myelós (moo-el-os') marrow ^G:N-M
perhaps a primary word

marrow.

• the marrow

Abbott-Smith

μυελός, -οῦ, ὁ, [in LXX: Ge 45:18 (חֵלֶב), Jb 21:24 (מֹחַ) Jb 33:24*;]
marrow: He 4:12.†

Abbott-Smith References

Liddell-Scott-Jones

μυελός, ὁ,

marrow, μυελὸς αὖτε σφονδυλίων ἔκπαλθ᾽ [Refs 8th c.BC+]; brain, [Refs 5th c.BC+]; μ. ῥαχίτης spinal cord, [Refs 5th c.BC+]

__2 fat, χηνὸς μ. [Refs 5th c.BC+]
__3 marrow as good food, ἐπὶ γούνασι πατρὸς μυελὸν οἶον ἔδεσκε [Refs 8th c.BC+], as becoming or making marrow, [LXX+8th c.BC+]
__4 metaphorically, νεαρὸς μ. [Refs 4th c.BC+]; πρὸς ἄκρον μ. ψυχῆς marrow, inmost part, [Refs 5th c.BC+]; Τρινακρίας μ., of Syracuse, [Refs 3rd c.BC+]
__5 generally, soft, marrow-like meat, [Refs 8th c.BC+]: ῠ always in Attic dialect; so also in the derivation words.]

_{LSJ Scripture Refs: LXX.Gen.45.18}