a. Obs. Also cæruleous, 8 -ious. [f. L. cærule-us CERULEAN + -OUS.] = CERULEAN.
1575. Laneham, Lett. (1871), 10. A Poet … in a long ceruleoous garment.
1633. T. Adams, Exp. 2 Peter iii. 7. The heavens are pure, bright, ceruleous.
1680. Boyle, Exper. Chem. Princ., II. 100.
1717. Phil. Trans., XXX. 569. The Pyrmont Waters excell all … in its bright Cærulious Lustre.
