δέοι (deoi)

δέοι is an Ancient Greek form of δέω, meaning “lack, need; (mid.) need, ask for”.

It can also be a form of δεῖ, “it is necessary, one must”. It is the 3rd person singular present active optative.

Found 349 times in the Ancient Greek texts on Socratos.

Where it is used

Thucydides, History of the Peloponnesian War 2.76.3: … είχους ἐκ τοῦ ἐντὸς μηνοειδὲς ἐς τὴν πόλιν ἐσῳκοδόμουν, ὅπως, εἰ τὸ μέγα τεῖχος ἁλίσκοιτο, τοῦτ’ ἀντέχοι, καὶ δέοι τοὺς ἐναντίους αὖθις πρὸς αὐτὸ χοῦν καὶ προχωροῦντας ἔσω διπλάσιόν τε πόνον ἔχειν καὶ ἐν ἀμφιβόλῳ μᾶλλον γίγν …

Plato, Philebus 21: … ς παντελῶς; οὐδαμῶς. ὅρα δή, τοῦ φρονεῖν καὶ τοῦ νοεῖν καὶ λογίζεσθαι τὰ δέοντα καὶ ὅσα τούτων ἀδελφά, μῶν μὴ δέοιʼ ἄν τι; καὶ τί; πάντα γὰρ ἔχοιμʼ ἄν που τὸ χαίρειν ἔχων. οὐκοῦν οὕτω ζῶν ἀεὶ μὲν διὰ βίου ταῖς μεγίσταις ἡδονα …

All forms of δέω (conjugation table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.