μεσεμβολ-έω · mesembol-eō — LSJ
intercalate
intercalate mean terms in a series, Nicom. Ar. 1.19:—Pass., Iamb. in Nic. p.85 P., Theol.Ar. 39.
II intercept
Astrol., intercept the influence of a planet, Vett.Val. 102.10, Cat.Cod.Astr. 1.107 (Pass.), Porph. in Ptol. 188; τὸν ἥλιον -ῆσαι τοῖς ἑπτὰ κοσμοκράτορσι Dam. Pr. 341:—Pass., ὁ ἥλιος πανταχοῦ μεμεσεμβόληται ibid.
III comes in the middle of
θάλασσα μεσεμβολεῖ τοὺς Αἰθίοπας comes in the middle of the E., Str. Chr. 1.32.