From the Greek for "image breaking", it was opposition to the use of Christian religious images in churches
The Byzantine term for the debate over religious imagery, "
iconomachy" means ... Christian worship by the sixth century had developed a 
clear hierarchy of... [DOC] [TLE] Iconoclasm | Article about iconoclasm by The Free Dictionary [PAR] Veneration of pictures and statues symbolizing sacred figures, Christian ... (kn`
klzm) [Gr.,=image breaking], opposition to the religious use of images.