An idiomelon is is assigned to one of the eight tones of Byzantine chant, is not patterned on any other hymn in terms of meter, content, or melody. It melodically follows the schema of the tone and yet is usually eccentric in its metre.
- Fr. Laurence (Campbell), eds., The Unabbreviated Horologion or Book of the Hours, 2nd Ed. (Brick, NJ:Yes Press, 1995), p 328.