Appositive

Appositive.—An appositive is a noun added to another noun or to a pronoun to describe or define it: Μιλτιάδης ὁ στρατηγός Miltiades, the general, ῡ̔μεῖς οἱ ἱερεῖς you, the priests, τοῦτο, ὃ σὺ εἶπες, ᾱ̓εὶ πάρεστι, σχολή this, which you mentioned, is always present, (I mean) leisure P. Th. 172d.

The genitive of an explicit word may explain the meaning of a more general word.

Ῑ̓λίου πόλις E 642, as urbs Romae, ἄελλαι παντοίων ἀνέμων blasts formed of winds of every sort ε 292. This construction is chiefly poetic, but in prose we find ὑὸς μέγα χρῆμα a monster (great affair, 1294) of a boar Hdt. 1.36, τὸ ὄρος τῆς Ἰστώνης Mt. Istone T. 4.46 (very rare, 1142 c). An articular infinitive in the genitive often defines the application of a substantive: ἀμαθίᾱ ἡ τοῦ οἴεσθαι εἰδέναι ἃ οὐκ οἶδεν the ignorance of thinking one knows what one does not know P. A. 29b.

a. But with ὄνομα the person or thing named is usually in apposition to ὄνομα: τῷ δὲ νεωτάτῳ ἐθέμην ὄνομα Καλλίστρατον I gave the youngest the name Callistratus D. 43.74.