ὑπελθετέον
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
(ὑπέρχομαι)
A one must take shelter under, ὑπὸ τὰς στοάς Str.13.3.6.
Greek (Liddell-Scott)
ὑπελθετέον: ῥημ. ἐπίθ. τοῦ ὑπέρχομαι, δεῖ ὑπελθεῖν, ἴδε ἐλθετέον.
Russian (Dvoretsky)
ὑπελθετέον: adj. verb. к ὑπέρχομαι.