Liddell-Scott-Jones

προστάτης (prostatēs) a superintendent ^G:N-M

προστάτης-ης, ου, ὁ,

(προΐστημι) one who stands before, front-rank man, falsa lectio for{πρωτοστάτης} in [Refs 5th c.BC+] —but elsewhere,

__II leader, chief, especially of a democracy, προστάτεω ἐπιλαβέσθαι [Refs 5th c.BC+]; οἱ τῶν δήμων π. [Refs 5th c.BC+]; [Σόλων] πρῶτος τοῦ δήμου π. [Refs 4th c.BC+]
__II.2 generally, ruler, opposed to ἀστοί, [Refs 4th c.BC+]; χώρας, χθονός, [Refs 5th c.BC+]; τῆς Ἑλλάδος προστάται, of the Spartans, [Refs 5th c.BC+]; π. τοῦ ἐμπορίου, of Greeks in Egypt, [Refs 5th c.BC+]; προστάται τῆς εἰρήνης its chief authors, [Refs]; τῆς πρὸς τοὺς θεοὺς ἐπιμελείας π. [Refs 4th c.BC+]; administrator, τῆς κεχωρισμένης προσόδου [Refs 2nd c.BC+]; [τοῦ ἱεροῦ] [Refs 1st c.AD+]: metaphorically, ἔρως π. τῶν ἀργῶν ἐπιθυμιῶν [Refs 5th c.BC+]
__II.3 president or presiding officer, π. τοῦ γυμνασίου [Refs 3rd c.BC+]; τῆς μέσης Ἀκαδημίας [Refs 2nd c.AD+]: frequently in plural, ={πρυτάνεις}, [Refs 4th c.BC+]
__III one who stands before and protects, guardian, champion, πυλωμάτων [Refs 5th c.BC+]; [τῆς ποιητικῆς] [Refs 4th c.BC+]; epithet of gods, as Apollo, [Refs 5th c.BC+]
__III.2 at Athens, etc., patron who took charge of the interests of μέτοικοι, etc.: hence ἐπὶ προστάτου οἰκεῖν live under protection of a patron, [Refs 5th c.BC+]; προστάτην ἐπιγράφειν τινά choose as one's patron, [Refs 5th c.BC+]; νέμειν π. [Refs 4th c.BC+]; also γράφεσθαι προστάτου to be entered by one's patron's name, be attached to a patron, οὐ Κρέοντος προστάτου γεγράφομαι [Refs 5th c.BC+]
__III.3 = Latin patronus, [Refs 1st c.AD+]
__IV θεοῦ π. one who stands before a god to entreat him, suppliant, [Refs 5th c.BC+]
__V in Medicine texts, prostate gland, [Refs 3rd c.BC+]