εἰκασμός
From LSJ
Δύο γὰρ, ἐπιστήμη τε καὶ δόξα, ὧν τὸ μὲν ἐπίστασθαι ποιέει, τὸ δὲ ἀγνοεῖν → Two different things are science and belief: the one brings knowledge, the other ignorance
English (LSJ)
ὁ,
A conjecturing, guessing, D.H.6.71 (pl.); εἰκασμοῦ ἐπίρρημα conjectural adverb (ἴσως), D.T.642.8; ἐξ εἰκασμοῦ λέγειν Str.17.3.1, cf. Plu.Mar.11, Luc. Herm.16.
German (Pape)
[Seite 726] ὁ, die Vermuthung; εἰκασμῷ λέγειν, Ggstz κατὰ βέβαιον ἱστορίαν, Plut. Har. 11; Luc. Hermot. 16.