Wiktionary
celto-germanic
a. 1 Of or pertaining to both the Celtic and Germanic peoples. 2 (context specifically English) Of, being, or pertaining to an artistic style developed in northern and western Europe between the fifth and ninth centuries characterised primarily by the use of recognisable human or animal structures http://en.wikipedia.org/wiki/Interlace%20(art) into complex designs and patterns, chiefly found in Christian http://en.wikipedia.org/wiki/Illuminated%20manuscript of Britain and Ireland.