caesitas

caesĭtas, ātis, f. [caesius],

• blue, blueness: oculorum, Boëth. ap. Porphyr. Dial. 2, p. 31; id. ap. Aristot. Categ. 3, p. 176.

caesitās, ātis, f. (caesius), die blau-graue Farbe, oculorum, Boëth. in Porph. comm. 4 u. ö.