cumdachn.

1887 M. Stokes Early Christian Art Ireland iv. 89 The first cumdach we read of..was made for the ‘Book of Durrow’, by the king of Ireland, Flann Sinna..who reigned between the years 877 and 916.

1908 Daily Chron. 30 Mar. 3/3 It is marvellous that any of those old manuscripts escaped the destructive raids of plundering Danes and Normans, especially as the cumdach, or cover, meant to preserve them from other injuries, was generally enriched with silver or gold, and sometimes inlaid with precious stones or enamels.

1960 G. A. Glaister Gloss. Bk. 93/1 Cumdach, a jewelled and elaborately decorated box used in late 9th-century Ireland for keeping manuscript books.