Usage: 2 forms in 3 verses
Form Translated As     In Verse(s)
μέλαθρον a ridge LXX.1Kgs.7.19
μέλαθρα a ridge LXX.1Kgs.6.5
ridges LXX.1Kgs.7.4

Liddell-Scott-Jones

μέλαθρον (melathron) a ridge G:N-N

μέλαθρον, τό,

Epic dialect genitive singular μελαθρόφιν [Refs 8th c.BC+]:—roof-tree, ridgepole, μελαθρόφιν ἐξεκέχυντο [same place],[Refs 8th c.BC+]: generally, beam, [LXX+2nd c.AD+]

__2 roof, [Refs 8th c.BC+]
__II house, κυπαρίσσινον μ. [Refs 5th c.BC+]; οὐράνιον μ., of heaven, [Refs 5th c.BC+]: mostly in plural, [Refs 7th c.BC+]; μ. ἐν βασιλείοις in the king's halls, [Refs 4th c.BC+]; of a cave used as a dwelling, [Refs 5th c.BC+]
__II.2 lair of an animal, [Refs 3rd c.AD+]
__II.3 cage, [Refs]; it is doubtful whether κμέλεθρον is cognate)