μελάνδρυον
From LSJ
ἁρμονίη ἀφανὴς φανερῆς κρείττων → the hidden attunement is better than the obvious one, invisible connection is stronger than visible, harmony we can't see is stronger than harmony we can, unseen harmony is stronger than what we can see
English (LSJ)
τό,
A heart of oak, Thphr.HP1.6.2. II v. μελάνδρυς.
German (Pape)
[Seite 119] τό, der schwarze Kern der Eiche (wofür Od. 14, 12 steht τὸ μέλαν δρυός), Theophr.
Greek (Liddell-Scott)
μελάνδρυον: τό, ἡ ἐντεριώνη, ἡ καρδία τῆς δρυός, Θεοφρ. π. Φυτ. Ἱστ. 1. 6, 2˙ ἀνθ’ οὗ ἐν Ὀδ. Ξ. 12 φέρεται τὸ μέλαν δρυός. ΙΙ. ἴδε ἐν λ. μελάνδρυς.