τετραγωνίζω

A. make square, square, of lines or numbers, Pl. R. 527a, Arist. Metaph. 996b21; ὅσαι γραμμαὶ τὸν ἰσόπλευρον . . ἀριθμὸν τετραγωνίζουσι all lines which form an equilateral number as their square, Pl. Tht. 148a; τ. τὸν κύκλον square the circle, Arist. SE 171b16:—Pass., Id. APr. 69a31.

2. Astrol., to be in quartile aspect, Ptol. Tetr. 34.