Discussion of accentuation patterns for adjectives and nouns ending in -ψ and -ος, including examples (κομψός, Λυκαψός, Γαληψός) and citations (Hecataeus, Thucydides, Strabo); note on neuter nouns and compound accent placement.
τρίτῳ. τὰ δὲ ἐπιθετικὰ πρὸ τοῦ 'ψ' ἔχοντα 'μ' ὀξύνεται, κομψός, γαμψός. Τὰ εἰς 'ψος' ὑπερδισύλλαβα ὀξύνεται, Λυκαψός κώμη πλησίον Λυδίας. Εὐφορίων Διονύσῳ· κινδαψός καὶ σκινδαψός ὀργάνου ὄνομα καὶ κύριον. τίθεται καὶ κατ´ οὐδενὸς ὡς τὸ τραγέλαφος, χορδαψός, Κυδαψός, Γαληψός πόλις Θρᾴκης καὶ Παιόνων. Ἑκαταῖος Εὐρώπῃ. Θουκυδίδης τετάρτῃ (c. 107) «καὶ Γαληψὸς οὐ πολλῷ ὕστερον καὶ Οἰσύμη». ὠνόμασται δὲ ἀπὸ Γαληψοῦ τοῦ ἐκ Θάσου καὶ Τηλέφης. Αἰδηψός πόλις Εὐβοίας. Στράβων ἐνάτῳ «κεῖται δὲ κατ´ Αἰδηψὸν τῆς Εὐβοίας, ὅπου τὰ θερμὰ λουτρὰ Ἡρακλέους». Λαδεψός καὶ Τρανιψός ἔθνη Θυνῶν. Θεόπομπος ὀγδόῳ Ἑλληνικῶν. Τακομψός κώμη ἐν τοῖς ὁρίοις Αἰγυπτίων καὶ Αἰθιόπων πρὸς τῇ Φίλῃ νήσῳ, ὡς Ἀρισταγόρας ἐν Αἰγυπτιακῶν πρώτῳ. Τὰ εἰς 'ος' λήγοντα οὐδέτερα ὀνόματα ἀεὶ βαρύνεται, τεῖχος, βέλος, πάθος, πέλαγος, ὕψος, ὕφος, σκύφος, στῖφος, δίψος, νέφος βρέφος, λαῖφος, αἶσχος, δέλος, δέος, κλέος, μέγεθος, στέλεχος. αἱ δὲ μετοχαὶ οὐδέτεραι ὀξύνονται, τετυφός, πεποιηκός, γεγραφός, ὥσπερ καὶ αἱ ἀρσενικαί. {1ΠΕΡΙ ΤΟΝΟΥ ΤΩΝ ΣΥΝΤΙΘΕΜΕΝΩΝ ΟΝΟΜΑΤΩΝ. ΒΙΒΛΙΟΝ θʹ. Περὶ τῶν εἰς 'ος'.}1 Τὰ ἀπὸ τῶν εἰς 'ος' προπαροξυτόνων σύνθετα προπαροξύνεται, φιλαλέξανδρος, φιλάνθρωπος, εὐστέφανος. Τὰ ἀπὸ τῶν εἰς 'ος' δισυλλάβων παροξυτόνων προπαροξύνεται, νόος Ἀλκίνοος, πόντος Ἑλλήσποντος ὁ κόλπος καὶ ἡ χώρα ἡ παρακειμένη
Third. Adjectives that have μ before ψ are accented on the acute: κομψός, γαμψός. Words in -ψος of more than two syllables are accented on the acute: Λυκαψός, a village near Lydia. Euphorion, in his Dionysus: κινδαψός and σκινδαψός, the name of an instrument and also a proper name. It is also used of a common noun, as τραγέλαφος; χορδαψός, Κυδαψός, Γαληψός, a city of Thrace and the Paeonians. Hecataeus, in his Europe. Thucydides, in the fourth book (c. 107): “and Γαληψός not much later, and Οἰσύμη.” It was named from Γαληψός, son of Thasos and Telephe. Αἰδηψός, a city of Euboea. Strabo, in the ninth: “it lies at Αἰδηψός of Euboea, where are the hot baths of Heracles.” Λαδεψός and Τρανιψός, tribes of the Thynians. Theopompus, in the eighth book of the Hellenica. Τακομψός, a village on the borders of Egyptians and Ethiopians by the island of Philae, as Aristagoras says in the first book of the Egyptian Affairs. Neuter nouns ending in -ος are always accented with the grave: τεῖχος, βέλος, πάθος, πέλαγος, ὕψος, ὕφος, σκύφος, στῖφος, δίψος, νέφος, βρέφος, λαῖφος, αἶσχος, δέλος, δέος, κλέος, μέγεθος, στέλεχος. But neuter participles are accented on the acute: τετυφός, πεποιηκός, γεγραφός, just as the masculine ones are. {1ON THE ACCENT OF COMPOUND NOUNS. BOOK 9. On those in -ος.}1 Compounds derived from proparoxytone words in -ος are proparoxytone: φιλαλέξανδρος, φιλάνθρωπος, εὐστέφανος. Compounds derived from disyllabic paroxytone words in -ος are proparoxytone: νόος, Ἀλκίνοος; πόντος, Ἑλλήσποντος, the gulf and the adjoining region.