κατὰ τὸ φιλόκαλον πειραθέντα κατανοῆσαι → see by working out the calculation
tower: P. and V. πύργος, ὁ.
top: P. and V. κορυφή, ἡ.
Met., extreme point: P. and V. ἀκμή, ἡ, ἄκρον, τό.
